`Security of the embassy of Britain in the center of Sofia has been tightened,` the National Gendarmerie Service announced. `We have not received any requests from other states for additional security or security measures in connection with the aerial strikes against terrorist bases in Afghanistan,` National Gendarmerie Service Director Colonel Zhivko Zhivkov said. `If such requests come from the diplomatic missions of NATO member states via the Foreign Ministry, we are ready to satisfy them,` he added. `In light of the terrorist attacks in the United States on 11 September, additional security and observation of the US embassy, consular office and diplomatic residences have been ensured so that no additional measures had to be undertaken after the strikes of the terrorist bases,` Zhivkov said.