A tense Philadelphia braced for more demonstrations Wednesday over the police killing of a Black man following two nights of protests that set off unrelated pilfering of stores on the other side of the city.

The death of Walter Wallace Jr., who was fatally shot by police Monday after authorities say he ignored orders to drop a knife, came amid already heightened tensions in the battleground state just days before the election.

About 500 people gathered in a West Philadelphia park Tuesday evening, marching to the nearby police headquarters where officers were stationed with riot shields. Some of the demonstrators threw debris at officers, according to police, and both sides later clashed.

Police said two officers were injured, although authorities did not disclose the extent of their injuries.

Some businesses were cleaning up damage Wednesday after video showed people streaming into stores and stealing goods as they left on the opposite side of the city from where Wallace was shot. The National Guard is slated to arrive in the next few days to focus on guarding infrastructure, state and city officials said.

The unrest started Monday evening, shortly after Wallace, 27, was killed.

Police said Wallace was wielding a knife and ignored orders to drop the weapon before officers fired shots Monday afternoon. But his family’s lawyer said the family had called for an ambulance to get him help with a mental health crisis. His parents said Tuesday that officers knew their son was in a mental health crisis because they had been to the family’s house three times on Monday.

Wallace’s wife, Dominique Wallace, is pregnant and scheduled to be induced Wednesday, according to the family’s attorney, Shaka Johnson. Johnson said Wallace had nine children — two briefly spoke at a news conference late Tuesday, along with Walter Wallace’s mother and father.

“When you come to a scene where somebody is in a mental crisis, and the only tool you have to deal with it is a gun ... where are the proper tools for the job?” Johnson said, arguing that Philadelphia police officers are not properly trained to handle mental health crises. Johnson said Wallace’s brother had called 911 to request medical assistance and an ambulance.

Police officials said they could not confirm what information had been given to the responding officers, whether they were told about a possible mental illness or how many calls they had received for help at Wallace’s address Monday. Chief Police Inspector Frank Vanore confirmed that police had received a call before the fatal encounter Monday about a man screaming and saying that he was armed with a knife.

Police Commissioner Danielle Outlaw said the officers involved in the shooting were taken off street duty as they investigate. Outlaw said the officers’ names and other identifying information, including their race, would be withheld until the department could be sure releasing the information would not pose a threat to their safety.

Neither had a Taser or similar device at the time of the shooting, Outlaw said, noting the department had previously asked for funding to equip more officers with those devices.

The two officers each fired at least seven rounds — at least 14 total shots — but Vanore could not say how many times Wallace was struck.

Wallace’s father, Walter Wallace Sr. said Tuesday night that he is haunted by the way his son was “butchered.”

“It’s in my mind. I can’t even sleep at night. I can’t even close my eyes,” he said.

In video filmed by a bystander and posted on social media, officers yell for Wallace to drop a knife. In the video, Wallace’s mother and at least one man follow Wallace, trying to get him to listen to officers, as he briskly walks across the street and between cars.

Wallace advanced toward the officers, who then fired several times, said police spokesperson Officer Tanya Little. Wallace’s mother screams and throws something at an officer after her son is shot and falls to the ground.

The video does not make it clear whether he was in fact holding a knife, but witnesses said he was. Police would not confirm any details about the weapon Wallace was alleged to be holding Tuesday, saying it is still part of the open investigation.

Wallace was hit in the shoulder and chest, Little said. One officer drove him to a hospital, where he was pronounced dead a short time later, she said.

Wallace’s death set off demonstrations Monday night, leading to the arrest of more than 90 people. Police said 30 officers were injured Monday, most of them hit with thrown objects like bricks.

During Monday’s unrest, police cars and dumpsters were set on fire as officers struggled to contain the crowds. More than a dozen officers, many with batons in hand, formed a line as they ran down 52nd Street, dispersing most of the crowd.

The 52nd Street corridor was also the site of protests against police brutality at the end of May, after George Floyd was killed by Minneapolis police. Those protests have been the subject of City Council hearings, with protesters describing harsh and unnecessary tactics, including tear gas and projectiles fired by police.-AP

Protesters gather for a march Tuesday in the US city of Philadelphia. Hundreds of demonstrators marched in West Philadelphia over the death of Walter Wallace, a Black man who was killed by police in Philadelphia on Monday.

Protesters confront police during a march Tuesday in the US city of Philadelphia.

A Philadelphia police officer bears the stains of an unidentified red substance during a confrontation with protesters, Tuesday, in Philadelphia.

Police killing of Black man stirs rage in US city of Philadelphia