Chris Helms

UPDATE: Police have made an arrest.

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Boston Police have issued a community alert after a woman was allegedly sexually assaulted and robbed at knife-point in Arnold Arboretum on Wednesday.

The incident took place Wednesday about 11 a.m., the victim told police.

The victim described the suspect as a black man in his early 20s, about 5-4 or 5-6. He had a thin build, was wearing a black do-rag, white shirt and dark-colored jeans with gray. He rode a black bicycle.

By police policy, they do not specify the exact locations of sexual assaults.

Police urge those with information about the attack to contact detectives at 617-343-5628 or the sexual assault unit at 617-343-4400. Anonymous tips can be called in to 1-800-494-TIPS or by texting ‘TIP’ to CRIME (27463).

Earlier this month, two women were robbed in the Arboretum.