Kenyan officials believe militants from the Somalia-based al-Shabab group, which has links to al-Qaeda, are planning to bomb Nairobi.
The Foreign Office reacted to news of what it described as a ‘heightened threat’ by updating its advice to Britons in or intending to travel to the Kenyan capital.
‘We believe that terrorists may be in the final stages of planning attacks,’ it said in a statement.
‘Attacks could be indiscriminate and target Kenyan institutions as well as places where expatriates and foreign travellers gather, such as hotels, shopping centres and beaches.
‘We strongly advise British nationals to exercise extra vigilance and caution in public places and at public events.’
The Foreign Office already advised against all but essential travel to the region of Kenya that borders Somalia, due to the risk of kidnapping.
A spate of kidnappings in the autumn prompted the Kenyan military to attack al-Shabab camps in southern Somalia, even though the group had denied any involvement with the gangs that snatched the European tourists.
Militiamen loyal to the terrorist group have vowed to hit back with a succession of bombings.
British tourists warned about terror threat in Kenya
The government has warned British tourists in Kenya to exercise ‘extra vigilance’ due to fears a terrorist attack is imminent.