A pro-IS social media channel tracked by the terror-monitoring SITE Intelligence Group showed a video on how to "create a bomb for Miss Universe", referring to the beauty pageant to be held in Manila in January 2017.
The video, posted yesterday, appeared to show how to make an explosive belt for suicide operations.
"We consider this as serious," said the tourism department, which last month announced it won the contest to host the 2017 pageant.
The threat would be referred to an intelligence group assigned to the pageant, national police spokesman Senior Superintendent Dionardo Carlos told AFP.
"That's going to be looked at," he said, without giving details.
Filipino Muslim militants operating in the south of the country have in recent years pledged allegiance to the IS, though security officials and analysts said they were more focused on raising ransom from kidnappings than propagating an ideology.
