"Initial investigations show they found shrapnel from a mortar-based improvised explosive device," Presidential Communications Secretary Martin Andanar said as much in a radio interview but he indicated that it was premature to declare that an IED caused the explosion.
The authorities have yet to categorically declare that the explosion was a bomb attack as of posting time.
The PNP earlier said that it still had no suspects as it continued to look into what caused the explosion.
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