A gang of London teenage girls is suspected of destroying three houses and killing a man with a homemade liquid bomb during an argument over a boy.

According to the U.K.'s Daily Mail, witnesses say a purple, smelly liquid was poured into a mailbox of one of the homes, which set off a massive explosion.

The intended target of the attack, Charlotte Anderson, was injured in the blast and rushed to the hospital with severe burns. Her next-door neighbor, Emad Qureshi, 26, who was at home with his parents, was killed when he was crushed by falling debris, it was reported.

Earlier, Anderson had phoned the police with a complaint that a gang of girls was harassing her over a boy outside her home.

Investigators inititally thought the explosion was caused by a gas leak, but now suspect the purple liquid — believed to have been made from a recipe found on the Internet — could have vaporized and caused the explosion, it was reported.

British police have launched a murder investigation and is searching for the girl gang, according to the Mail.

Click here to read the full report in the Daily Mail.