The second test launch of the Angara-A5 heavy rocket from the Plesetsk space center in northwestern Russia was tentatively postponed from November 24 to November 28, a rocket and space industry source told TASS.

"The launch is tentatively scheduled for November 28," the source said.

At the same time, the source added that the launch window has been set for November 20-29, and "the final decision about the date of the blastoff will be made later."

Earlier, a rocket and space industry source told TASS that Angara-A5 will lift off on November 24.

Russian space agency Roscosmos said in August that preparations for flight tests of the Angara-A5 rocket began at Plesetsk in August.