Nairobi, Kenya (CNN) -- Two Britons were killed while vacationing in the Kenyan coastal city of Mombasa, the Foreign Office said early Sunday.
Norman Joel and an unidentified person were reported killed on October 15, the office said. An autopsy had been conducted and the next-of-kin informed.
An investigation is under way, said a spokeswoman, who cannot be named in line with policy.
The office declined to say the manner they were killed or what their relationship was.
"That is all the information I can give at the moment," the spokeswoman said.
In its Web site, the Foreign Office warns citizens about incidents such as robberies and muggings targeting foreigners in the country, especially in Mombasa and the capital, Nairobi.
"Muggings and armed attacks by gangs can occur at any time, particularly in Nairobi and Mombasa," it warns. "Do not carry valuables or wear jewelry in public."
Two British nationals were killed during robberies at their homes last year, according to the Foreign Office.
In October of the same year, two Britons and an Irish citizen were attacked by six men while on tour in central Kenya, it said.
More than 120,000 British nationals visited Kenya last year, the British Foreign Office said on its Web site.