No group has claimed responsibility for the attack yet, but Rita Katz, director of Site Intelligence Group, which tracks extremist propaganda, claimed that a Filipino operative of the Islamic State had said "lone wolf soldiers" were responsible.
Resorts World Manila said the shooting triggered a lockdown, and that it's working with police in the case.
"We ask for your prayers during these hard times", said a message on the verified account.
Dela Rosa said he could not say if it was terrorist attack, but emphasised the gunman did not shoot anyone and there had been no reports of hostages being taken.
All terminals at Ninoy Aquino International Airport were placed on lockdown because of the attack, according to Robert Echano with airport operations.
Duterte declared martial law in the Mindanao region, the southern third of the Philippines, to crush the insurrection and poured in troops backed by airstrikes, artillery fire and armoured vehicles. News channel ANC said there were two gunmen, wearing masks and black clothes.
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The bad blood between the two stemmed from a pair of home runs Harper hit off Strickland in the 2014 playoffs. "I don't know. After being hit in the hip by a pitch from Giants' reliever Will Strickland, Harper charged the mound and a brawl ensued.
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It was Aberg's first career playoff goal and he was skating on the first line in place of the injured Ryan Johansen . For Anaheim to win and send this series back to California they need to elevate their game in all areas.
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Manchester bombing: 10 remain in critical condition
I am taking these concerns seriously and, at the appropriate time , they will be subject to a full evaluation and briefing. Police officers and army personnel had rushed to a street in Hulme after a "suspicious package" was discovered there.