The US embassy has also told US citizens to stay alert and avoid large public gatherings, a day after Ugandan police thwarted a suicide bombing attack in Kampala.

Patrick Onyango, the spokesperson of Kampala Metropolitan Police, said that the police arrested a 28-year-old suspected suicide bomber before he entered Rubaga Miracle Centre, a church operated by the prominent Ugandan preacher Pastor Robert Kayanja.

Mr Onyango said that the arrested suspect was helping the police to locate three other suspects believed to be part of a co-ordinated plot targeting churches across Uganda.

According to police reports, the man had concealed an improvised explosive device in a food flask placed in a bag.

Authorities successfully detonated the explosive, which comprised of nails, a cell phone, detonator, booster charger and other components.