Attacks, some claimed by the Pakistani Taliban, have risen, mostly targeting police and security officials
"Nine cabinet ministers of the new all-party government took their oaths before President Gotabaya Rajapaksa," a presidential news statement said.
Veteran politician Ranil Wickremesinghe took over as prime minister this month to form a new cabinet after the president's elder brother, Mahinda Rajapaksa, resigned from the job.