The masked man stormed into the Resorts World casino and hotel complex in the capital of Manila on Friday with an M4 automatic rifle and a bottle of petrol, before setting alight one of the main gaming rooms.
Thirty-seven people died in the fire, dozens more were injured in a stampede to escape, and the gunman was found dead about five hours later in a hotel room after committing suicide by setting fire to himself, police said.
"They (IS) may claim credit but, according to evidence, it is not so," presidential spokesman Ernesto Abella said.
"The evidence at this stage points to the actions of an emotionally disturbed person who was apparently engaged in criminal actions."
However Manila police chief Oscar Albayalde told AFP today they had not identified the gunman.
"We are doing everything we can to identify this person and ensure the safety of our countrymen," he said on government radio.
"We are looking at the taxi driver who may be able to identify him."
But Albayalde and other police chiefs said repeatedly throughout Friday that recorded security footage showed the gunman drove to the casino and parked his vehicle in the complex's car park.
"The CCTV (footage) shows that he parked his car, took out his gun and directly went inside Resorts World," Albayalde said yesterday.
Police had also given confusing or contradictory statements on other key parts of the incident on Friday.
National police chief Ronald dela Rosa initially said police had shot the gunman dead, but then later reported the assailant wrapped himself in a blanket and burnt himself to death.
Dela Rosa also said the gunman had not shot anyone, but Resorts World reported one of its security guards had suffered a gunshot wound.
Albayalde said yesterday that the assailant was likely a foreigner, describing him as a caucasian who spoke English.
But they said the gunman later left the backpack in a bathroom after filling it up.
President Rodrigo Duterte imposed martial law last week across the southern region of Mindanao to crush what he called a rising threat from IS.
He made the move shortly after local militants who have declared allegiance to IS went on a rampage through the city of Marawi, about 800 kilometres south of Manila.
A Muslim separatist rebellion in the south of the mainly Catholic Philippines has killed more than 120,000 people since the 1970s.
The main Muslim rebel groups have signed accords with the government aimed at forging lasting peace, giving up their separatist ambitions in return for autonomy.
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