The mental state of the attacker and his motives are not yet known, and the police are investigating.
The Ismaili community is shocked and saddened by this incident and is providing support to the families of the victims.
Prime Minister António Costa conveyed his solidarity to the victims’ families and to the Ismaili community. He said: “Everything points to this being an isolated incident.”
The perimeter of the building has been secured and the Ismaili community is cooperating fully with a police investigation.