Manila, Jan. 30 -- An explosion led to the discovery of a kitchen-type shabu laboratory in Tanza, Cavite, the Philippine Drug Enforcement Agency (PDEA) said Thursday.

In a statement, PDEA said the blast rocked a residential compound at about 6 a.m. Tuesday, along Leon Fojas Street in Barangay Sahud-Ulan.

Responding officers then found various drug paraphernalia, equipment and various types of suspected chemicals inside the house.

A search by PDEA and the local police also resulted in the discovery of various types of illegal drugs.

A manhunt is ongoing against four suspects - a Filipino woman, a Chinese-looking individual and two Indonesians.

The pieces of drug evidence recovered have been brought to the PDEA Laboratory and are being...