A suicide bomber killed at least five people at a crowded night spot in the city of Beni in the eastern Democratic Republic of Congo Saturday, local officials reported.

Officials blamed the Allied Democratic Forces (ADF) militia, one of the deadliest armed groups in the region and claimed by the Islamic State group as its central Africa arm.

"The suicide bomber, prevented by security from gaining access to the bar, packed with clients, activated the bomb at the entrance," said a statement from military officials running North Kivu province.

Another 13 people were being treated for their wounds in hospitals, the statement added, describing the death toll as provisional.

Shortly after the blast, Narcisse Muteba, the colonel running the city during the state of emergency in the east of the country, had called on residents to return to their homes for their own safety.

An AFP correspondent saw the remains of three bodies at the site of the explosion, the In Box restaurant. The remains of tables, chairs, bottles and glasses were scattered across the blast site.

One city hall source told AFP that two children were among the dead, as well as two local officials.

More than 30 people were celebrating Christmas there when the bomb went off, two witnesses told AFP.

"I was sitting there," local radio presenter Nicolas Ekila told AFP. "There was a motorbike parked there. Suddenly the motorbike took off, then there was a deafening noise."

A police vehicle took the wounded to a nearby medical centre, which was immediately sealed off.