Four people were killed in a fire in a shopping center in the US city of Burlington, WA.

Surroundings Cascade Mall shopping center cordoned off by the police are searching for the alleged attacker. It is not known whether he carried out the attack alone, or he had accomplices. Motives for the attack are not clear.

The alleged shooter could head towards the motorway I-5, reports the Seattle Times, citing witnesses.

Washington State Police spokesman Mark Francis wrote in Twitter, that survived the attack at the moment evacuated to a nearby church. According to him, the attacker - or attackers - left the shopping center until the police arrived.

City of Burlington is located approximately 100 km from Seattle. It is reported by BBC.