PHILADELPHIA (AP) – Police leaders are struggling to answer questions about what led to the death of Walter Wallace under more than a dozen rounds fired by two Philadelphia officers. Police Commissioner Danielle Outlaw deferred many questions at a news conference Tuesday about events before the previous afternoon’s shooting of the 27-year-old Black man that led to unrest and arrests. Chief Inspector Frank Vanore says that police received a call about a man screaming and that he was armed with a knife. He says the two officers each fired at least seven rounds but could not say how many times Wallace was struck. Officials say neither officer had a stun gun. More than a dozen people were arrested and more than 30 officers injured in protests stemming from the shooting. Officials said Tuesday that the 27-year-old Wallace refused police orders to drop a knife in the confrontation captured on video. Wallace’s father told The Philadelphia Inquirer that his son appeared to have been shot 10 times and had struggled with his mental health.