Detroit is outfitting its bus fleet with surveillance cameras in an ongoing effort to stop violence.

John Roach, a spokesman for Detroit Mayor Mike Duggan, said the city already has some prototypes cruising the streets.

The installation process for cameras on 50 city buses will begin next week and should be completed in a month.

Plans for the cameras were announced last year amid security concerns including attacks on drivers and worries by passengers. Just last week, a 14-year-old boy was stabbed while trying to intervene as two riders argued on the bus.

Read related story:Person arrested in teen's stabbing on bus is not suspect

Federal funding is supporting the effort.

DDOT has 445 buses, including 100 it plans to retire.