The United States government is investigating whether an air raid in Syria killed a civilian instead of the “senior al-Qaeda leader” initially identified as its target.

Shortly after the May 3 attack, the brother of the man killed denied that the victim had any links to al-Qaeda. On Friday, US Central Command (CENTCOM) said that it continues to investigate those allegations.

“CENTCOM continues to assess the outcome of the strike and has been made aware of allegations that the strike may have resulted in a civilian casualty,” spokesman Major John Moore said on Friday.