Tunisia's President Beji Caid Essebsi declared a nationwide state of emergency and curfew in Tunis after a deadly bomb attack Tuesday on a presidential guard bus in the capital.

"As a result of this painful event, this great tragedy... I proclaim a state of emergency for 30 days under the terms of law, and a curfew in greater Tunis from 9:00 pm (2000 GMT) until 5:00 am (0400 GMT) tomorrow," he said in a televised address.