The attack was reported along a stretch of the Delaware & Raritan Canal park trail in Somerset County. The man fled on a bicycle; police are looking into any similarities with reported assaults last year.
A man with a heavy build, said to be in his 30s, was being sought in connection with a sex assault reported by a female runner on Monday evening in Somerset County.
The man with a distinct neck tattoo had been stretching in Big Brook Park just before noon on Thursday, the woman said, when he attacked her with a knife. She managed to fight him off.