BRUSSELS—Belgian authorities have charged a man with murder in connection with Tuesday’s Brussels terrorist attacks, suspecting him of being the terrorist who fled the airport after the deadly suicide bombings.

The charges were announced four days after 28 victims and three suicide bombers were killed and 340 injured in attacks at Brussels airport and at a subway station. The Islamic State extremist group took responsibility for the attacks.

The federal prosecutor’s office identified the murder suspect as Fayçal C., arrested Thursday in front of the prosecutor’s office. He was charged with terrorist murders, participation in a terrorist group and attempted terrorist murders.

A person familiar with the investigation identified the suspect as Fayçal Cheffou and said authorities were seeking to confirm whether he was indeed the man wearing a hat as seen on security footage captured at Brussels airport minutes before two suicide attackers detonated bombs on Tuesday.

Investigators were analyzing finger prints and DNA samples, the person added.