Police in Philadelphia arrested four juveniles in connection with Friday night's mob attacks around Temple University.
Authorities told CBS News the attacks on college students were carried out by bands of as many as 100 boys and girls.
Temple University spokesman Ray Betzner told the local NBC affiliate WCAU in Philadelphia that the juveniles played a "cat-and-mouse game" with police.
Police said the college students were surrounded, punched, kicked and robbed by groups of 20 to 30 teens.
Authorities added that a boy punched a police horse in the face twice and threw a Temple officer to the ground.
One student told CBS Philadelphia that he was leaving work around 9:30 p.m. Friday when he saw what looked like a group of 200 juveniles walking in groups.
He also overheard police say the juveniles were playing "the knockout game," which involves assaulting people without warning.
The Temple student then said a juvenile, who appeared to be about 10 years old, started yelling at him and grabbing his phone. He added that the same juvenile then came back and threw the phone at his face.
Philadelphia and Temple University police are still investigating the incidents.
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