In Portland the attack with a knife has injured several people

The knife attack, which injured several people, happened in Portland (Oregon), city police are investigating.

Police say the incident occurred Tuesday at 22.39 local time (Wednesday 08.39 GMT) in the area Montavilla to the East of Portland.

"When officers arrived on the scene, they found numerous victims with knife wounds", - is spoken in the message.

Guards cordoned off the crime scene and started investigation.