The United Kingdom told its citizens Friday to stay away from the Resorts World Manila in Pasay City after an attack at the entertainment and casino complex left 38 dead, including the gunman.
"Following a security incident at the Resorts World hotel in Pasay, Manila on 2 June 2017, you should avoid the immediate area of the incident and follow the advice of local authorities," the UK government said in a travel advisory on its website.
It said the Ninoy Aquino International Airport, Manila's flagship airport located near the casino complex, remained on "red alert" and that citizens "should be prepared for additional security measures or delays."
Earlier Friday, the United States and Australia also urged its nationals in the Philippines to exercise heightened caution following the attack in Resorts World Manila.
A lone gunman went on a rampage at the casino before dawn Tuesday, firing a number of shots and torching casino tables. The still unidentified assailant also attempted to steal P113 million worth of casino chips.
The Resorts World management said casino security shot the gunman, who later locked himself in a room and set himself on fire. Police have ruled out terrorism as a motive behind the attack.