BEIRUT (AFP) - A suicide bomber killed at least 22 people on Monday in an attack targeting a party in the northeastern province of Hasakeh, the Syrian Observatory for Human Rights and medics said.

"A suicide bomber blew himself up inside a hall in Tall Tawil village during the wedding of a member of the Syrian Democratic Forces, killing at least 22 civilians," Observatory chief Rami Abdel Rahman told AFP.

The SDF is an Arab-Kurdish coalition battling militants of the Islamic State in Iraq and Syria (ISIS) group in northern Syria.

"The bridegroom was among the dead," Abdel Rahman added.

A hospital source in Hasakeh city told AFP there were "more than 20 dead and dozens wounded".

The AFP correspondent saw many wounded people, some with bloodied bandages on their heads.

A source in the Asayesh security forces in the self-administered Kurdish territories also said a suicide bomber had blown himself up in the wedding hall a few kilometres north of Hasakeh.

The almost entirely Kurdish-held city has often been targeted by militants of ISIS.