Armed police are patrolling St Kilda after a man was stabbed when he confronted an intruder in his home this morning.

The critical incident response team have placed Wellington St in lockdown with fears the offender may still be in the area.

Special operations group members are also on patrol.

Police were called to the apartment block about 4am after reports a knife-wielding man had attacked a man when he returned home with a woman.

Police say the man was stabbed in the arm and the back before the offender fled.

Detectives remain on scene.

More to come