As police cracked down on anti-war protests on college campuses across the US in recent weeks, among those arrested were a pair of silver-haired 65-year-old professors armed only with their cell phones.

Annelise Orleck was knocked to the ground and restrained with plastic handcuffs at a protest at Dartmouth College in New Hampshire. She later complained of whiplash.

Steve Tamari was tackled by officers and taken into custody at a demonstration at Washington University in St. Louis, an attack he said resulted in multiple broken ribs and a broken hand.

Orleck and Tamari are among at least 50 professors arrested at campus protests across the country, according to a CNN review of police records, court filings, and news reports. (Since April 18, more than 2,400 students have been arrested amid protests on more than 50 campuses.) In some cases, professors said they were actively participating in protests based on their own beliefs. Others said they attended to show support for their students.