A mother in Massachusetts has been accused of biting an instructor after her son was denied the chance to take his driving test.

Ilyse Levine-Kanji, 50, allegedly sank her teeth into the forearm of the instructor at their local Registry of Motor Vehicles on Thursday, before threatening to stab him with a pen. She eventually fled the scene, The Berkshire Eagle reports, and was later arrested.

According to witnesses, the pair arrived at 11am and were told by the instructor that it would not be safe for Levine-Kanji's son to take the driving test.

Levine-Kanji reportedly protested and when the instructor refused to give way, she allegedly snatched his pen and raised it above her head as if in a stabbing motion.

When he grabbed at her arm to protect himself, she allegedly sank her teeth into his arm.

After the mother and son fled the scene, state police stopped the vehicle on the Massachusetts Turnpike. She was then arrested on charges of assault with a dangerous weapon.