PHILADELPHIA (AP) — 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 night that officers knew their son was in a mental health crisis because they had been to the family’s house three times on Monday.

Cathy Wallace, his mother, said one of the times, “they stood there and laughed at us.”

The Wallace family’s attorney, Shaka Johnson, said the man’s wife, Dominique Wallace, is pregnant and is scheduled to have labor induced Wednesday. 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.

Local officials had anticipated a second night of unrest Tuesday, after Philadelphia police arrested more than 90 people during protests and unrest that began Monday and spread into the early morning hours of Tuesday, sometimes turning into violent confrontations with police.

Police had previously said 30 officers were injured in the Monday night unrest, most of them hit with thrown objects like bricks. One officer was still hospitalized Tuesday with a broken leg after being purposely run over by a pickup truck, police said.

The rally and march followed a community meeting where Police Commissioner Danielle Outlaw said people were tired of “hearing the same thing over and over again.”

Outlaw said at a news conference Tuesday that she was still reviewing when and what information would be released to the public. The officers had not been interviewed as of Tuesday afternoon, she said. 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.

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. The officers were taken off street duty during the investigation.

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.

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.

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.