The United States on Tuesday warned of possible attacks against expatriates and foreign visitors in Nigeria’s biggest city, Lagos, during public holidays marking the end of the Muslim holy month of Ramadan.

“The US Mission in Nigeria advises that groups associated with terrorist activity might be planning attacks against hotels in Lagos frequented by international visitors, including those located on waterfronts, during the Eid-al-Fitr holidays,” it said.

Tuesday and Wednesday are public holidays in Nigeria and the traditional end of a month of fasting and prayer is marked by celebrations across the country.

The US Embassy’s latest warning did not mention a specific group but urged its citizens to “review your personal security plans, remain aware of your surroundings, including local events, and monitor local news stations for updates.”