NATO has said technical failure was behind its destruction on Sunday of a residential building in Libya’s capital, where officials said nine civilians were killed.
The admission of error was the second in 24 hours.
The other was an attack on a rebel convoy, in NATO operations mandated to protect civilians in the conflict against Libyan leader Muammar Gaddafi.
Spokesman for NATO, Wing Commander Mike Bracken said: “The intended target during last night’s air strike in Tripoli was a military missile site. However, from our initial assessment of the facts it appears that one weapon did not strike the intended target due to a weapons systems failure. This technical failure may have caused a number of civilian casualties. NATO regrets the loss of innocent civilian lives.”
It has been three months since NATO warplanes went into action over Libya.
Rebel fighters took casualties from artillery fire from pro-Gaddafi forces near the city of Misrata on Sunday.
A doctor at a field hospital near the frontline in Dafniyah, west of Misrata, said eight rebels were killed and 36 wounded.