Two hurt in pre-F1 Bahrain unrest, police use teargas (video)

Two people were injured in an overnight attack on police in Bahrain, authorities said on Saturday, as activists called for a new attempt to march on the capital's former Pearl Square ahead of the Grand Prix.

Preparations for Sunday's Formula One race at the Sakhir circuit in the south were unaffected by the unrest.

"Targeting police patrols with Molotov cocktails on Isa Al-Kabeer road led to injuring two Asians," the interior ministry announced on its Twitter account late on Friday without elaborating, AFP reports.

"They were referred to hospital."The radical February 14 Revolution Youth Coalition, a clandestine cyber-group that had called a week-long campaign dubbed "Volcanic Flames", urged supporters on Twitter to march on the focal point of Shiite-led protests in early 2011.

Security forces have been on high alert during days of protests to prevent clashes from marring the race, with checkpoints at major intersections, especially on roads leading to the racing circuit.

The month-long 2011 protests in Bahrain, home to the US Navy's Fifth Fleet, were crushed with the help of Gulf troops led by neighbouring Saudi Arabia.