Economist Kazuhide Uekusa, who was once a regular guest on TV programs but was convicted for trying to look up a girl's skirt in 2004, has been arrested on suspicion of groping a 17-year-old female high school student on a train in Tokyo, police said Thursday.

Uekusa, 45, a visiting professor at Nagoya University of Commerce & Business' graduate school, allegedly put his hand up the girl's skirt and fondled her around 10:10 p.m. Wednesday between Shinagawa and Kamata stations on the Keihin Kyuko Line.

While riding the train, the girl, a second-year high school student from Kanagawa Prefecture, shouted, "Stop it," after allegedly being groped. She and two other passengers seized Uekusa and handed him over to policemen, who were alerted and waiting at Keikyu Kamata station.

Uekusa has denied the allegation, saying he has no memory of groping the girl as he was drunk.