One of the two rockets hit a local mosque, witnesses said.

The attack comes on the fifth day of Turkey's offensive in northern Syria against Kurdish militia viewed as "terrorists" by Ankara.

Many of the wounded had been inside the mosque when it was hit by rockets which the Turkish media said were fired by the Syrian Kurdish People's Protection Units (YPG).

Police have sealed off the area and asked people to stay away, an AFP correspondent said.

Tekinarslan said a second rocket hit within 100 metres (300 feet) of the first.

One witness, Abdulkadir Ciyanoglu, said he was at the mosque before it was hit.

"When I left, I arrived at my shop. It was within a minute that... I heard a very loud sound. I saw everyone running in panic," he told AFP.

Ankara launched its military operation dubbed "Olive Branch" on Saturday, with air and artillery strikes against the YPG in the Afrin region.

Turkey views the YPG as a terror group linked to the outlawed Kurdistan Workers' Party (PKK) waging an over three-decade insurgency inside Turkey.

The PKK is proscribed as a terror organisation by Ankara and its Western allies.

There have been multiple rockets hitting Turkish border towns since the offensive began.

The Turkish military immediately responded to the attacks with artillery fire, the correspondent said.