The Kenyan government has described as "completely unfortunate” the terror alerts issued by the United States and the United Kingdom, but urged Kenyans to remain vigilant even as it celebrated the country’s success in battling Al-Shabaab.

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Kenya’s Foreign Affairs Principal Secretary Korir Sing’oei said the country was recording major success in battling the Al-Qaeda-linked terror group.

"Unilateral terror alerts are completely unfortunate but the circumstances under which they have been issued is due to pressure Al-Shabaab are feeling in Somalia from the combined efforts of Somali administration, community and our troops. They are actually on the run and it is believed that some may have crossed into our borders,” Dr Sing’oei said.

"Therefore, the basis of that kind of intelligence is what has led to pre-cautionary terror alerts. It is not a red alert on an impending thing. This is just to make people aware of their environment like over-crowded places. The effect of this alert is that this administration has beefed up security levels in critical installations like public places.”

Through its embassies in Nairobi, the US and the UK said that terrorist groups could stage an attack with little or no warning, targeting areas with many people.

The embassy asked US citizens to exercise vigilance at locations frequented by tourists and foreigners, to review their personal security plans, be conscious of their surroundings and to monitor local media for updates.

"Terrorist groups could attack with little or no warning, targeting hotels, embassies, restaurants, malls and markets, schools, police stations, places of worship and other places frequented by foreigners and tourists,” the US statement said.