Russia's Roscosmos space agency said in a brief statement that a Proton-M rocket carrying a Mexican satellite had suffered a problem on launch early today.
"An emergency situation took place when the Proton-M rocket launched with a MexSat-1 satellite. The reasons are being identified," the agency said.
"The Mexican satellite is lost. Launches of rockets of the Proton type will be grounded until the reason is identified," a source in the space industry told RIA Novosti state news agency.
The failure came just hours after a separate glitch in which a Russian Progress spacecraft docked to the ISS failed to switch on its engines on command from mission control in a planned manoeuvre to shift the ISS into a higher orbit.
Russia's space programme has experienced a troubling number of accidents in recent years.
RIA Novosti state news agency criticised what it called "a negative record for Roscosmos -- several accidents in space in three weeks."
British singer Sarah Brightman announced Wednesday that she would not fly to the ISS as a space tourist in September as planned, citing personal reasons. Russian media speculated she pulled out over safety fears.
The Mexican satellite launch took place at 8:47 am Moscow time from Russia's Baikonur cosmodrome in Kazakhstan.
The Proton-M rocket lost communications with the ground about a minute before the satellite was supposed to separate from the third stage rocket.
Russia earns millions of dollars from the launches of Western and Asian commercial satellites.
