Philippine authorities are temporarily blocking an online gaming app after a school shooting
Duterte was detained as he returned to Manila on Tuesday, officials said.
One U.S. military service member and three defense contractors were killed.
The voting machine company executives allegedly paid $1 million in bribes.
More than 15,000 people have moved into emergency shelters since last week.
Cambodia, Laos, Malaysia, Singapore, and Vietnam have also been affected.
