Ugandan police, in a security crackdown following deadly suicide bombings, said Tuesday they had arrested four Somalis for bringing a suspected explosive device into a resort due to host President Yoweri Museveni this week.

A week after twin bombings killed four in the capital Kampala, police spokesman Fred Enanga said a detonator was discovered during a routine vehicle search at the nearby resort of Speke Munyonyo.

“The joint-anti terrorism security team has in custody four Somalia nationals,” he told AFP.

“We now have the duty to trace… the main component of the suspected explosive device,” he said. 

The popular hotel, which has welcomed heads of state in previous years, is due to host a ministerial meeting on Thursday chaired by Museveni.

Police have tightened security in recent weeks after Uganda suffered a series of deadly attacks, including last week’s suicide bombings in Kampala claimed by the Islamic State (IS) group.