Gun shots and explosions rang out from an entertainment resort in the Philippine capital Manila early on Friday and local media reported armed men were inside the complex.
Resorts World Manila said on social media it was in lockdown and the local fire department said a blaze was burning on the second floor of the building.
Military spokesman Restituto Padilla said the police were in control of the situation and the army was monitoring closely.
Witnesses who spoke to radio stations said several gunmen were seen in the complex. News channel ANC said there were two gunmen, wearing masks and black clothes.
The information could not be immediately verified.
A source at one of the resorts told Reuters that employees were being evacuated and declined to give more details.
No group has claimed responsibility.