Until the problem was fixed, Discovery had to sit at least 120 metres (400 feet) from the station for fear that its thrusters might damage the fragile wing if it was loose.

BBC: Discovery docks with space station

"If Bulgaria did not have enough arguments to announce yesterday that the traces in this attack lead to Hezbollah's military wing, we would not have done it, " Nikolay Mladenov told a TV station.

BBC: Hezbollah hits out after Bulgaria bus bomb report