A senior official of the Fukuoka Stock Exchange has been arrested for allegedly taking upskirt photos of two female high school students on a train in southwestern Japan, police said Wednesday.

The bourse's executive director Shinichi Sakai, 62, is suspected of using a tablet to secretly take upskirt photos of the two 17-year-old girls sitting across from him on a train traveling in Fukuoka Prefecture around 12:50 p.m. Tuesday, according to police.

Sakai has denied the charge, and was quoted as telling the police, "I only took pictures of their feet."

The girls heard a shutter sound and reported the incident to station staff when Sakai alighted at Mikunigaoka Station. Authorities later confirmed there were photos of the girls on his device.