WASHINGTON: Authorities said on Tuesday that a 15-year-old boy died and two others were critically injured in a shooting outside a high school in Des Moines, Iowa's capital city, and that possible suspects had been detained.

According to emergency officials, the two injured were female teenagers aged 16 and 18.Police said they began receiving reports of gunfire from a passing vehicle at 2.48 p.m. on Monday.

Des Moines police had earlier tweeted that there were "multiple shooting victims" outside East High School, which is located approximately 2.4 kilometres northeast of the city's downtown area.

Officials have not released the identities of the victims, nor have they confirmed whether they were students.Des Moines Public Schools said in a statement on Monday afternoon that the school had been placed on lockdown but had been given the all-clear.

"Police are actively investigating, Students are leaving on time." The Kansas City Field Division of the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), which covers states including Iowa, tweeted that special agents from its Des Moines field office are assisting police with the investigation. "This is a dark day for the city of Des Moines," said Des Moines police chief Dana Wingert on Monday evening.

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