Officials from the Independent Police Complaints Commission said in their report they hope to soon tell the public why Jean Charles de Menezes, 27, an electrician from Brazil, was killed July 22.
Menezes was shot seven times in the head by police the day after the failed attacks on the London transit system and two weeks after the July 7 bombings on the system that killed 56 people.
Immediately after the shooting, Police Commissioner Ian Blair said Menezes "was directly linked to the ongoing and expanding anti-terrorist operation." But the following day, Blair said that was not the case. He expressed his "deepest regrets" and accepted "full responsibility."
The commission was established in 2004 to restore public confidence after a series of high-profile deaths of minority suspects in police custody, The Washington Post said.