A British man has been killed and his wife kidnapped from a Kenyan resort, Kenyan police say.
The married couple were staying at the luxury Kiwayu Safari Village, north of Lamu Island, when armed men attacked.
Kenyan officials said a police officer saw six men taking away a woman in a speed boat.
Tourist resorts have not been targeted before but the site is near Somalia and Somali pirates could be involved, a BBC reporter says.
The website for Kiwayu Safari Village says it has "organic security protocols as well as a professional security structure which provides us with overarching security and safety 24 hours a day."
It adds: "Our relationship with the local community, its fishermen and the local authorities is positive and mutually beneficial. We regularly review our security and safety to ensure it is both comprehensive and current."
Police Commissioner Mathew Iteere said the couple arrived at the resort on Saturday after visiting Kenya's Masai Mara reserve and were the resort's only guests.
Speaking at a news conference Mr Iteere said it was likely that the man was killed with a single shot after he tried to resist the abduction.
BBC East Africa correspondent Will Ross said police described the group as bandits and said there was no evidence to suggest Islamist group al-Shabab, which has links to al-Qaeda, was involved.
The Foreign Office, which did not release the names of the couple, called for the immediate release of the woman.
It said it was working with Kenyan authorities to establish further details about the attack, and has sent staff from the high commission in Nairobi to the area.
It continues to advise against all but essential travel to within 30km (18 miles) of Kenya's border with Somalia. There have been previous attacks by Somali militia into Kenya, it says.
Somali pirates have in the past targeted fishing vessels not far from Lamu.
Kenyan police have said they have been on high alert in many areas of the country on the anniversary of the 9/11 attacks in the US.
