BEIJING (AP) — A city government says seven people were killed and 59 injured in an explosion at the front gate of a kindergarten in eastern China as relatives were picking up their children at the end of the school day.

The Xuzhou city government in Jiangsu province said the blast at the Chuangxin Kindergarten in Fengxian, which struck at 4:50 p.m. Thursday, was under investigation.

It wasn’t immediately clear whether the explosion was deliberately set or the result of an accident.

A cellphone camera video posted on the website of the official People’s Daily newspaper showed more than a dozen people lying motionless in front of the kindergarten’s steel sliding gate, with clothing, shoes and other items strewn on the ground beside pools of blood.

It showed ambulances arriving and medics wheeling people into an emergency room.

Calls to the kindergarten and local hospitals rang unanswered.

Kindergartens in China have been targeted before in apparent revenge attacks carried out by people bearing grudges against their neighbors and society.

That has prompted a tightening of security around many schools, with the posting of guards equipped with truncheons and the installation of gates and other barriers.

China maintains tight control over firearms and most attacks are carried out using knives, axes or homemade explosives.

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