The British Foreign Office has updated its advice to Nigeria, Niger and the Ivory Coast following French military operations in Mali.
On its website, the FCO advised vigilance, saying there is a possibility of retaliatory attacks targeting Western interests in the region.
On Sunday, French warplanes bombed the town of Gao in eastern Mali in a bid to help government forces recapture the central town of Konna from Islamist rebels. Islamist groups and secular Tuareg rebels took advantage of chaos following a military coup to seize northern Mali in April 2012. One Islamist group, Ansar Dine, began pushing further south last week.
The UK has provided two C17 transport planes to aid the French effort.
Islamist groups in West Africa are still holding several French hostages and have threatened reprisals against them and other French targets.
