AKIPRESS.COM - A bomb exploded on a bus with Tunisian presidential guards in the capital Tunis on Tuesday, killing at least 12 people in an attack one source said was probably the work of a suicide bomber, reports Reuters.

Ambulances rushed wounded from the scene and security forces closed off streets around Mohamed V Avenue, one of the main streets in Tunis, before the president declared a curfew in the city and imposed a state of emergency nationwide.

"They want to make us live with horror but we are going to bring that horror to the terrorist camps," President Beji Caid Essebsi said in a televised speech. "We are at war and we are going to win."

Security sources said the guards were boarding the bus to be taken to the presidential palace on the outskirts of the city when it blew up. One presidential source said it was likely that a bomber had detonated his explosive belt inside the bus.

At least 12 guards were killed and 17 wounded, according to an Interior Ministry statement.