CHICAGO (CBS) — Two teenage boys were charged Thursday night after they allegedly threw rocks at vehicles on the Chicago Skyway and caused authorities to close the toll road for more than two hours.

The boys, one 14 and the other 15, were charged with one count of felony vehicular endangerment and six counts of misdemeanor criminal damage to property, police said in a statement, adding that the teens were turned over to the Juvenile Detention Center for processing.

Police worked with Chicago Public Schools and “developed information [that] implicated two CPS students as the individuals involved,” the statement said.

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The Wednesday night incident sparked a manhunt, as police believed the damage to vehicles was caused by a shooter firing at random at passing cars.

Police first responded about 9 p.m. on Wednesday at Indianapolis Avenue and 105th Street to a call of shots fired, police said.

The vehicles were hit with projectiles that damaged hoods and windshields, but did not penetrate the vehicles, Calumet Area police said.

Police initially thought the damage came from gunfire, but authorities found no bullets or shell casings, and no one was shot, police said. A K-9 unit and SWAT teams later found rocks lined up along railroad property near the highway.

Seven vehicles were damaged, possibly from rocks, said police News Affairs Officer Amina Greer, who confirmed police found no evidence bullets were used.

The Skyway from the Dan Ryan to the Indiana border was closed for at least two hours.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2012. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)