Firefighters found this onion bomb hidden in bushes in Salford near where the boys were injured.
They've confiscated it and are warning of the dangers of fireworks.
Onion bombs aren't meant to be available to the public.
More top news
The worlds of music and sport will join forces on Saturday 22nd October to raise money for the North West ABF Soldiers’ Charity.
An initiative which gives people funds to pay for energy alongside emergency food, has now helped thousands across the Wirral.
Detectives investigating the death of Mohammed Yousaf in Accrington have arrested two more people.