(CNN) At least two people were killed in an explosion outside a busy shopping mall in the southern Philippines Monday.

Cotabato City Police spokesman Christopher Lee told CNN there was a suspected "IED explosion" outside the South Seas Mall in Cotabato City on the island of Mindanao.

Another 34 people were injured in the blast, three of whom were in critical condition, local police spokesman Chief Inspector Rowell Zafra said.

Zafra added that a second, smaller improvised explosive device was discovered in the second-floor baggage area of the mall, and was detonated safely by authorities.

A lockdown that was put in place for the city after the bomb exploded has since been lifted, but additional troops have been deployed across Cotabato in a push to increase security.

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