Rabbi Jake Rubin, executive director of the Brody Jewish Center at the University of Virginia, called Warmbier “one of the most intellectually curious people I’ve ever met” during the service held Thursday at Wyoming High School near Cincinnati, The Associated Press reported.

Warmbier, whose mother is Jewish, became active in the Hillel after a Birthright trip to Israel, during which he received a Hebrew name. A spokesman for the family said this week that they chose not to disclose his Judaism during negotiations for his release so as not to antagonize North Korea. The 22-year-old was sentenced to 15 years of hard labor for stealing a propaganda poster on what North Korea claimed were orders from an Ohio Methodist church.

Some 2,000 people attended the public service at the high school and more mourners lined the street. U.S. Sen. Rob Portman, a Republican from the Cincinnati area, told reporters outside that North Korea must be held accountable for Warmbier’s detention and death.

“This college kid never should have been detained in the first place,” said Portman, who met secretly with North Korean officials in New York last December to press for Warmbier’s release. He said North Korea’s treatment of Warmbier demonstrated “a basic disregard for human rights, for human dignity.”