The death toll has risen again after the attack by suspected militants on a luxury hotel complex in the Kenyan capital of Nairobi on Tuesday.
Kenyan authorities have now confirmed 21 fatalities and 19 people unaccounted for.
A British citizen, a worker for an international development charity, was among the victims.
Witnesses heard gunfire and blasts at the compound in the Westlands district of the city, which houses the five-star DusitD2 hotel.
Kenyan media said gunmen arrived by car and shot their way past security guards and threw explosives at cars in the car park before entering the building.
The Somalia-based militant group al-Shabab, which opposes the Somali government, said it was behind the attack.
Dusit Hotels and Resorts issued a statement saying staff and management were devastated by the attack and extended their deepest sympathies to all those affected.
"Our highest concern is the safety and well-being of our guests and employees, and we are providing support in every way we can. Efforts are ongoing to get in touch with all staff members and guests at the hotel to ensure they are all accounted for.
"Our guests and upcoming reservations are being relocated to other hotels in the city, and the hotel is closed until further notice."
The Foreign Office told British citizens in Kenya told visitors to remain vigilant and follow the advice and instructions of local authorities.
Anyone in the UK worried about a British national in Kenya is advised to call the FCO in London on 020 7008 1500.
