Media reports said the tissue was found by a female mall personnel at the first level of the Mindanao car park adjacent to the department store of Trinoma.
Written on the tissue was a threat reportedly warning mallgoers to vacate the building in an hour before a bomb explodes.
The bomb squad of the Quezon City Police District (QCPD) conducted a search but did not find any traces of explosives in the area.
The bomb scare did not cause panic among mallgoers, reports said.
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