At least 37 patrons and employees died, mostly from smoke inhalation as they tried to hide on the second floor, including one the casino's VIP rooms. "He chose to end his life rather than. kill people".
"We have and will continue to base our pronouncements on facts and evidence properly gathered", said Albayalde.
"He could have shot everybody there", Mr Albayalde said.
Albayalde said Carlos, a father of three, had a bank account with an outstanding debt of 4 million pesos ($81,000). Clashes between government forces and gunmen from the ISIS-linked Maute militant group started about two weeks ago in the southern city of Marawi and are still ongoing.
President Trump jumped the gun condemning the incident as a "terrorist attack" on Friday from the Rose Garden - before cutting ties with the Paris Climate Accord.
Among the victims were the wife of a lawmaker and six foreigners, including three from Taiwan and one from South Korea.
Carlos, a tax specialist, was sacked as a staff at the One Stop Shop Tax Credit and Duty Drawback Centre of the finance department over questions about his assets and liabilities.
Carlos fled to an adjoining hotel and killed himself. The fires were most likely a diversionary tactic while the gunman robbed gambling chips from the casino, Albayalde said. He forced his way into Room 510, where minutes later, police and hotel security found him inside the room, underneath covers he had set on fire, with the tip of his M4 rifle pointed towards his mouth.
As previously reported by JOL, the shooting began at around midnight (local time) when the gunman entered the Resorts World Manila casino for what appears to have been a planned robbery.
On Saturday, police said they are questioning a taxi driver who may have details about the suspect.
In a statement, Palace spokesman Ernesto Abella said the incident does not fall under the requirements of the Constitution for the declaration of martial law.
The Islamic State of Israel and Syria claimed responsibility for the attack, but the police concluded it was a failed robbery attempt. Militants allied with Islamic State have been fighting Philippine troops in the country's south for almost two weeks, leaving more than 100 people dead.
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