What began with the arrest of two Drexel University students earlier this month ended overnight with the arrest of three men accused of operating a drug ring around campus.

Raphael Zappala and Joshua Dassay of Philadelphia, and Wesley Crawford of Ardmore are charged with delivery, possession with intent to deliver, conspiracy, use of a communication device to facilitate a narcotics transaction and endangering the welfare of a child. According to the District Attorney's office, the three ran the ring for more than a year, earning up to $15,000 a week. Police raided a property on the 4800-block of Florence Street overnight, where they found $28,000 worth of LSD and $10,000 in cash.

The investigation began when a Drexel student arrested in Upper Moreland tipped police off to the ring and agreed to cooperate with authorities.