Minibus blast near British Embassy
Bahrain's interior ministry has said a blast occurred inside a minibus parked near the British Embassy.
However there were no immediate reports of serious damage or injuries.
A brief statement posted by the ministry said the explosion occurred in a public parking area near the British diplomatic compound in the capital Manama. Investigators sealed off the area.
Security has been boosted sharply across Bahrain during annual Shiite religious ceremonies.
Bahrain's majority Shiites began an uprising in February seeking greater rights from the Gulf kingdom's Sunni rulers.
An independent commission investigating Bahrain's unrest issued a report last month accusing security forces of abuses such as torture against suspected protesters.
Meanwhile on Saturday night in the city of Muharraq, Shiites formed a procession marking Ashura, a period of mourning for Imam Hussein, grandson of Islam's founding prophet Mohamed.
The marchers passed an area where clashes erupted during Friday evening's procession between pro-government supporters, police and marchers.
Graffiti on the wall reads "Down with Hamad", a reference to Bahrain's king