A double murder inquiry has been launched in the Moss Side area of Manchester after two people were stabbed, police said.
Greater Manchester Police (GMP) said two people had died "despite the best efforts" of emergency services who had been called to Great Southern Street at about 05:00 GMT.
A man has been arrested on suspicion of murder, the force said.
A cordon has been established and GMP has asked people to avoid the area.
A post on GMP's Facebook account for Longsight & Moss Side read: "There is an emergency services presence on Great Southern Street in Moss Side whilst officers respond to an incident.
"Police have attended and despite the best efforts of emergency services, two people were treated at the scene and have sadly been pronounced dead.
"We have arrested one man on suspicion of murder.
"Please avoid the area as there is a large emergency service presence while we establish the full circumstances of the incident this morning."