Explosion in Russian McDonald's

It is not yet clear why the restaurant was targeted

Russian police are investigating a bomb blast which damaged a McDonald's restaurant in St Petersburg.

Russian media say a small bomb went off on Sunday night under a table, injuring six people, two of them children. The blast partially destroyed the ceiling.

Police in St Petersburg say it was probably an act of "hooliganism", rather than terrorism.

The blast happened at about 2030 (1730 GMT) at a restaurant on Nevsky Prospekt, the city's main thoroughfare.

Some windows were broken but no fire resulted from the blast.

One of the injured was a German tourist.

Correspondents say such explosions are not uncommon in Russia, and there was a similar blast in a St Petersburg supermarket just last weekend.