At least nine people were killed and more than 25 injured in three separate explosions Wednesday in the northeastern Syrian city of Qamishli, the Britain-based Syrian Observatory for Human Rights monitoring group told AFP.

An AFP correspondent in the city said the restaurant blast took part in a Christian neighbourhood.

Qamishli is under the shared control of the Syrian regime and Kurdish authorities, who have declared zones of "autonomous administration" across parts of north and northeast Syria.