SHANGHAI (AP) — Shanghai police say they’ve identified a 29-year-old inveterate gambler as the lead suspect behind a small explosion at the city’s main international airport that injured four people.

A statement issued Monday on the police force’s microblog said Zhou Xingbai had traveled to Shanghai from the neighboring province of Jiangsu to commit the crime and had posted on the internet that he was deep in debt and intended to “do something really crazy.”

It said Sunday’s explosion was carried out using fireworks stuffed inside empty beer bottles.

The blast at a check-in area at Pudong International Airport, China’s second-busiest, occurred at around 2:20 p.m., but caused no disruptions to flights. Zhou was believed to have been among those taken to the hospital, possibly with a self-inflicted injury to the neck.

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