Kenyan police close in on British woman connected to terror attacks He was arrested in the coastal town of Mombasa last month, in an apartment where police also found chemicals, batteries and an electric switch. Kenya is on heightened alert after police warned on Friday that there was a risk of fresh terror strikes following its invasion of Somalia in October to crush al-Shabaab, which has links to al-Qaeda. The Foreign Office issued an update to its travel advisory for British tourists travelling to Kenya after the police warning last week. The renewed advice was prompted by the Kenyan alert. But British intelligence officials, who have been in Mombasa helping Kenya's terror investigations, are understood to have separate information which points to the threat of an impending attack in the capital, Nairobi. "The Kenyan authorities have alerted the public to a heightened threat from terrorist attacks in Nairobi," the updated Foreign Office advice states. We believe that terrorists may be in the final stages of planning attacks. We strongly advise British Nationals to exercise extra vigilance and caution in public places and at public events. Foreign Office spokesman would not give details of the new threat, citing security reasons and for fear of jeopardising intelligence operations. Alfred Mutua, the government spokesman in Nairobi, could not be reached yesterday, but a senior government source said: "We have no information of any new attack, only that we know Shabaab are waiting to do something." "We just want to be very alert because our Kenya Defence Forces are doing a very good job in Somalia," Anthony Kibuchi, Nairobi's police chief, said on Saturday after Kenya's new terror warning. Now the sympathisers of al-Shabaab are like a wounded buffalo, very dangerous. I was just asking members of the public to be extra alert. The Foreign Office spokesman refused to comment on specific reasons for the new warning to British visitors. "We are aware that the Kenyan authorities are interested in speaking to British nationals in relation to possible links to al-Shabaab," she added.