A 61-year-old school bus driver has been arrested for the alleged sexual assault of three children with developmental disabilities, Toronto police say.

Police allege that the driver, Frank Gavas, assaulted three children under the age of 13 between September 2015 and this month. Police said they started investigating after receiving a tip from the Children's Aid Society.

The Toronto man was arrested Jan. 23 and charged with six counts of sexual assault and six counts of sexual interference and appeared in court last weekend.

Gavas was employed by Stock Transportation from 2006 and has driven for numerous schools in the Scarborough area, including Georges Vanier Secondary School, Wexford Public School, George Peck Public School and Sloane Public School, police say.

Police said in a news release they're concerned there could be more victims. 

Anyone with information is asked to contact police at 416-808-4100, Crime Stoppers anonymously at 416-222-TIPS (8477), online at 222tips.com, text TOR and your message to CRIMES (274637).