WORCESTER, Mass. (WPRI) — Worcester officials have warned the public to be on the lookout after three homemade explosive devices were found last month.

Fireworks, a butane gas can and projectile materials were discovered after a small explosion in the area of Madison Street on June 19, according to a joint press release from the city.

Two non-detonated devices made from similar materials were also found inside coolers, officials said.

Anyone who sees unattended coolers or other suspicious items is advised to call 911.

“Massachusetts residents have caused themselves grievous injuries while attempting to create homemade explosive devices. These devices are illegal and potentially fatal,” State Fire Marshal Jon Davine said.

The investigation is ongoing.

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