A powerful explosion ripped through a firecracker warehouse in Zamboanga City in the southern Philippines on Saturday, killing five people, including a child, and wounding at least 20 others.

Local authorities said the blast, which happened shortly after 4 p.m. local time, created a 1.14-km impact radius and damaged houses and commercial establishments near the warehouse.

City Mayor John Dalipe, who rushed to the blast site, confirmed to reporters that five people died, and rescuers rushed 20 more to hospitals.

The City Disaster Risk Reduction and Management Office listed eight patients in critical condition.

The cause of the blast is being investigated.