PHILADELPHIA (CBS) – Two people have been arrested and a warrant issued for a third following an assault at a Philadelphia elementary school.

On March 25 around 2:30 p.m., police responded to Jay Cooke Elementary at 1300 W. Louden Street for reports of an assault (see previous story).

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Upon entering, police were told by School Police that the parents of a student who attended the school had entered the building along with several additional family members and had assaulted ten students and three school officials. The suspects then fled the school.

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One person had to be taken to the hospital for a concussion.

On Friday, police said they’d arrested 42-year-old Marion Oliver, of N 16th Street, and her 14-year-old daughter. Both are charged with 12 counts of Simple Assault, Recklessly Endangering Another Person, Conspiracy and related offenses.

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A warrant was also issued for 44-year-old Richard Jordan, whose last address was on the 4900 block of Penn Street. Anyone with information on his whereabouts should contact police immediately.