(reuters) -- The coalition said in a statement that during July, it had investigated 37 reports of civilian casualties. It found that only 13 of the reports were credible and there were an estimated 61 unintentional civilian deaths.

The coalition is investigating another 455 reports of civilian casualties caused by its artillery or air strikes, the statement said. It has now acknowledged at least 685 civilian deaths due to its air and artillery strikes since the conflict began in August 2014.

The deadliest incident investigated in July was a March 14 strike near Mosul, in which the coalition attacked an Isis position where fighters were firing at coalition allies. That strike is believed to have killed 27 civilians in an adjacent structure, the statement said.