A Metro Transit bus driver was taken to the hospital Friday with minor injuries after an altercation with two young men in downtown Minneapolis. Howie Padilla, spokesman for Metro Transit, said investigators are interviewing those involved, talking to witnesses and viewing footage taken from the bus camera. The incident happened shortly before 5 p.m at Fifth Street and Hennepin Avenue. The driver was taken to Hennepin County Medical Center. This is the third incident in five weeks in which Metro Transit bus drivers were injured in physical confrontations. On April 10, a driver was attacked after asking a couple of disruptive riders to get off a bus in North Minneapolis. A week later, on April 19, another bus driver was kicked and punched on Nicollet Mall in downtown Minneapolis. Padilla said each incident was unique. Employee safety was a key sticking point during negotiations over the latest contract between Metro Transit and the union that represents its drivers. The union argued that Metro Transit had not done enough to prevent attacks on drivers. Earlier this year, Metro Transit began testing protective Plexiglas shields that partially enclose drivers.