Ethiopian police said on Saturday they had stepped up security measures nationwide after the United States warned of possible suicide attacks against neighbouring countries by "extremist elements" in Somalia, according to Reuters. U.S. Embassies in Ethiopia and Kenya urged American citizens on Thursday to be vigilant and use extreme caution when visiting well-known public places in both countries. Extra checks were being carried out at all border posts, train stations and airports, he said, as well as random checks on vehicles in the capital Addis Ababa and other towns.