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LOWELL — An Ayer man has been arraigned on charges alleging that he, along with a juvenile co-defendant, assaulted and robbed two teenagers in January, Middlesex District Attorney Leone announced.

Robert Malcolm, 17, was arraigned today in Lowell Superior Court on charges of assault with the intent to rob, unarmed robbery, and assault and battery (two counts). The commonwealth asked that he be held on $50,000 cash bail plus conditions. Lowell Superior Court Judge Richard Tucker ordered the defendant held on $1,500 cash bail with the conditions that he is ordered to be monitored by GPS, that he be under house arrest, and have no contact with the victims or witnesses in the case.

His next court date is May 10 for a pretrial conference.

According to authorities, on Jan. 4, Malcolm and a juvenile co-defendant were driving to the center of town in Ayer when they spotted the two victims walking along the street. It is alleged that the defendants decided to rob the two victims and exited the vehicle to do so. They allegedly then followed the two victims, cornering them at the back of a house, where they allegedly assaulted the victims and robbed them of their money. The defendants then fled.

Ayer police and members of the Middlesex District Attorney’s Office commenced an immediate investigation into the alleged assault and robbery of the two victims. Malcolm was arrested and arraigned on Jan. 5 in Ayer District Court where bail was set at $1,500 cash bail. He was indicted by a Middlesex County grand jury on March 30.

These charges are allegations and the defendant is presumed innocent until proven guilty.

The prosecutor assigned to this case is Assistant District Attorney Sean Casey. The victim witness advocate is Kathleen Keefe.