The Kenyan capital's main international airport was shut for several hours on Sunday following the crash-landing of a domestic flight, airport officials said.

The Kenyan Airports Authority said a Fokker 50 flying from Wajir in the northeast and operated by Skyward suffered landing gear failure and landed on its belly at Jomo Kenyatta International Airport, blocking the sole runway. No casualties were reported.

Kenyan security forces on Wednesday carried out fresh raids on mosques in the port city of Mombasa searching for weapons and supporters of Somalia's Shebab militants, police said.

Grenades, ammunition and petrol bombs were seized in raids on the Swafaa and Minaa mosques, taking the total to four mosques searched since Monday in the tense city, officers said.

At least four people were killed in the Kenyan coastal city of Mombasa on Sunday in an attack by armed men on a motorbike, according to medical sources.

Another eight people were wounded in the shooting, said the same source.

Hundreds of British tourists are being evacuated from beach resorts near Kenya's coastal city of Mombasa following new warnings of terror attacks, officials and tour operators said Friday.

Special charter flights were organized days after Britain, France, Australia and the United States issued new travel warnings for Kenya's coast following a wave of attacks and unrest linked to Islamist extremists.