Minnesota Gov. Tim Walz called in the National Guard on Thursday as looting broke out in St. Paul and a wounded Minneapolis braced for more violence after rioting over the death of George Floyd, a handcuffed black man in police custody, reduced parts of one neighbourhood to a smoking shambles.

The Minneapolis unrest ravaged several blocks in the Longfellow neighbourhood, with scattered rioting reaching for miles across the city. It was the second consecutive night of violent protests following Floydsa国际传媒檚 death Monday. In footage recorded by a bystander, Floyd can be seen pleading that he cansa国际传媒檛 breath as an officer kneels on his neck. As minutes pass, he slowly stops talking and moving.

Businesses across the Twin Cities were boarding up their windows and doors Thursday in an effort to prevent looting. The city shut down nearly its entire light-rail system and all bus service through Sunday out of safety concerns.

Around midday Thursday, the violence spread a few miles away to St. Paulsa国际传媒檚 Midway neighbourhood, where police said 50 to 60 people rushed a Target attempting to loot it. Police and state patrol squad cars later blocked the entrance, but the looting shifted to shops along nearby University Avenue, one of St. Paulsa国际传媒檚 main commercial corridors, and other spots in the city. By early evening, the windows of more than a dozen stores were smashed, and firefighters were putting out a handful of small blazes.

St. Paul spokesman Steve Linders said authorities were dealing with unrest in roughly 20 different areas.

sa国际传媒淧lease stay home. Please do not come here to protest. Please keep the focus on George Floyd, on advancing our movement and on preventing this from ever happening again,sa国际传媒� tweeted St. Paul Mayor Melvin Carter, who is black.

Erika Atson, 20, was among several hundred people who gathered outside government offices in downtown Minneapolis, where organizers called for peaceful protest.

Atson, who is black, described seeing her 14- and 11-year-old brothers tackled by Minneapolis police years ago because officers mistakenly presumed the boys had guns. She said she had been at sa国际传媒渆very single protestsa国际传媒� since Floydsa国际传媒檚 death and worried about raising children who could be vulnerable in police encounters.

sa国际传媒淲e donsa国际传媒檛 want to be here fighting against anyone. We donsa国际传媒檛 want anyone to be hurt. We donsa国际传媒檛 want to cause any damages,sa国际传媒� she said. sa国际传媒淲e just want the police officer to be held accountable.sa国际传媒�

Hennepin County Sheriff David Hutchinson said the rally had been peaceful and there had been no arrests by late evening.

The governorsa国际传媒檚 order did not say how many Guard members were mobilized or whether they would be in service Thursday night. After calling in the Guard, Walz urged widespread changes in the wake of Floydsa国际传媒檚 death.

sa国际传媒淚t is time to rebuild. Rebuild the city, rebuild our justice system and rebuild the relationship between law enforcement and those theysa国际传媒檙e charged to protect,sa国际传媒� Walz said.

Thursday morning in Minneapolis, smoke rose from smouldering buildings in the Longfellow neighbourhood. In a strip mall across the street from the policesa国际传媒檚 3rd Precinct station, the focus of the protests on both nights, the windows in nearly every business had been smashed, from the large Target department store at one end to the Planet Fitness gym at the other. Only the 24-hour laundromat appeared to have escaped unscathed.

sa国际传媒淲HY US?sa国际传媒� demanded a large expanse of red graffiti scrawled on the wall of the Target. A Wendysa国际传媒檚 restaurant across the street was charred almost beyond recognition.

Among the casualties of the overnight fires: a six-story building under construction that was to provide nearly 200 apartments of affordable housing.

sa国际传媒淲esa国际传媒檙e burning our own neighbourhood,sa国际传媒� said a distraught Deona Brown, a 24-year-old woman standing with a friend outside the precinct station, where a small group of protesters were shouting at a dozen or so stone-faced police officers in riot gear. sa国际传媒淭his is where we live, where we shop, and they destroyed it.sa国际传媒� No officers could be seen beyond the station.

sa国际传媒淲hat that cop did was wrong, but Isa国际传媒檓 scared now,sa国际传媒� Brown said.

Others in the crowd saw something different in the wreckage.

Protesters destroyed property sa国际传媒渂ecause the system is broken,sa国际传媒� said a young man who identified himself only by his nickname, Cash, and who said he had been in the streets during the violence. He dismissed the idea that the destruction would hurt residents of the largely black neighbourhood.

sa国际传媒淭heysa国际传媒檙e making money off of us,sa国际传媒� he said angrily of the owners of the destroyed stores. He laughed when asked if he had joined in the looting or violence. sa国际传媒淚 didnsa国际传媒檛 break anything.sa国际传媒�

The protests that began Wednesday night and extended into Thursday were more violent than Tuesdaysa国际传媒檚, which included skirmishes between offices and protesters but no widespread property damage.

Mayor Jacob Frey appealed for calm but the citysa国际传媒檚 response to the protests was quickly questioned as things started spiraling into violence. sa国际传媒淚f the strategy was to keep residents safe sa国际传媒� it failed,sa国际传媒� City Council Member Jeremiah Ellison, who is black, tweeted. sa国际传媒淧revent property damage sa国际传媒� it failed.sa国际传媒� On Thursday, he urged police to leave the scene of the overnight violence, saying their presence brings people into the streets.

But Eric Kowalczyk, a police captain in Baltimore during the Freddie Gray riots in 2015, generally supported the Minneapolis police strategy to avoid confrontations with protesters when possible, saying heavy-handed police responses are only met with more violence.

sa国际传媒淣obody wants to see their city on fire, but at the same time, you donsa国际传媒檛 want to see citizens injured by the very police department they are protesting,sa国际传媒� he said.

Protests also spread to other U.S. cities. In California, hundreds of people protesting Floydsa国际传媒檚 death blocked a Los Angeles freeway and shattered windows of California Highway Patrol cruisers. Memphis police blocked a main thoroughfare after a racially mixed group of protesters gathered outside a police station.

Amid the violence in Minneapolis, a man was found fatally shot Wednesday night near a pawn shop, possibly by the owner, authorities said.

Fire crews responded to about 30 intentionally set blazes, and multiple fire trucks were damaged by rocks and other projectiles, the fire department said. No one was hurt by the blazes.

The city on Thursday released a transcript of the 911 call that brought police to the grocery store where Floyd was arrested. The caller described someone paying with a counterfeit bill, with workers rushing outside to find the man sitting on a van. The caller described the man as sa国际传媒渁wfully drunk and hesa国际传媒檚 not in control of himself.sa国际传媒� Asked by the 911 operator whether the man was sa国际传媒渦nder the influence of something,sa国际传媒� the caller said: sa国际传媒淪omething like that, yes. He is not acting right.sa国际传媒� Police said Floyd matched the callersa国际传媒檚 description of the suspect.

The U.S. Attorneysa国际传媒檚 Office and the FBI in Minneapolis said Thursday they were conducting sa国际传媒渁 robust criminal investigationsa国际传媒� into the death. President Donald Trump has said he had asked an investigation to be expedited.

The FBI is also investigating whether Floydsa国际传媒檚 civil rights were violated.

The officer who kneeled on Floyd and three others were fired Tuesday. The next day, the mayor called for the kneeling officer to be criminally charged. He also appealed for activation of the National Guard.

Tim Sullivan And Amy Forliti, The Associated Press

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