The GSLV-F06 mission has failed, with the launch vehicle exploding about roughly 55 seconds into the flight, at about an altitude of 13km. It was carrying the GSAT-5P communications satellite.
The plan was to use GSLV to launch the Chandrayaan-2 mission. Now that schedule would have to set back by today's failure. That's too bad, because Chandrayaan-2 was scheduled to be the nearest moon launch by anyone, which would have made it the first mission to follow up on the discovery of water on the Moon.