Investigators work on a scene of an explosion in the southern Russian city of Rostov-on-Don, Russia, April 6, 2017. REUTERS/Stringer

MOSCOW (Reuters) - There was an explosion in the southern Russian city of Rostov-on-Don early on Thursday, and one person was hurt, a law enforcement source told TASS news agency.

REN-TV cited witnesses as saying that the explosion happened near a school on Sadovaya Street and that a maintenance worker was injured in the blast.