GRAND RAPIDS, Mich. (WOOD) — Two 11-year-old girls from the east side of the state were hurt Thursday after lighting a firework that exploded in their home.

One girl suffered minor injuries from debris, and the other lost four fingers on one hand.

News 8 affiliate WDIV-TV reports the two girls, who are twins, were in their bathroom at their home in River Rouge, about 10 miles southwest of Detroit. They thought the firework would only emit sparks, but police believe the explosive had power similar to a stick of dynamite.

“They lit the firework and it exploded on them. Neighbors said it sounded like an actual explosion,” WDIV reported. “Police said they believe the firework was more powerful than an M-80 based on the structural damage caused inside the home.”

The girls’ mother was reportedly at work when the incident happened. Neighbors are credited with jumping in and helping the girls after the explosion, applying a tourniquet to one girl’s hand and trying to keep them calm.

Police are investigating who sold the illegal explosive and criminal charges are possible.

River Rouge Deputy Police Chief Dasumo Mitchell told Fox 2 Detroit that education and safety protocols are pivotal, especially around the upcoming Fourth of July holiday.

“Don’t bring explosives in the house and educate the kids … and have supervision when using fireworks,” Mitchell told Fox 2.

Although several changes were made by the Michigan Fireworks Safety Act, signed into law by Gov. Rick Snyder in 2011, there are still several restrictions in place for fireworks. They can only be used on specific days and times, which can be altered by local municipalities. They can only be lit on personal property, and felony or misdemeanor charges can be filed in incidents that cause property damage, injury or death.

Michigan’s Department of Licensing and Regulatory Affairs recommends all consumers only buy fireworks from state-certified retailers, always follow the manufacturer’s instructions, keep a safe range and douse spent fireworks in a bucket of water before throwing them in the trash.