According to AP, a small device placed in a Tehran building housing the offices of British Airways and British Petroleum exploded early Tuesday, but no injuries were caused, the British Embassy said.
The device detonated at about 9:50 a.m. on the 10th floor of the Sayeh Building in the downtown district of the Iranian capital, said Mitra Behnan Mojtahedi, a public affairs officer at the embassy.
The exploding device that appeared similar to a concussion grenade, which produces only a loud noise and a shock wave on detonation, caused no damage. It was not immediately clear who was behind the blast.
Offices of British Airways, British Petroleum, Lloyds and Mercedes Benz are located on the 10th floor of the Sayeh Building, which is in Valiasr Ave in Tehran.
The British Embassy praised Iranian officials for the response to the incident, Mojtahedi said without elaborating.
Iranian officials were not immediately available for comment.