Newly discovered witnesses to the Aug. 9 fatal shooting of Missouri teen Michael Brown are corroborating other witnesses' comments that Brown was taking a conciliatory stance when a police officer fired at him, according to new reports.

Two contractors standing about 50 feet from the shooting scene in Ferguson, Mo., and captured on cell phone video told CNN that they heard one gunshot and another then saw Brown, 18, staggering and saying, "OK, OK, OK." Ferguson Police Officer Darren Wilson kept shooting and Brown's hands were up, the witnesses said.

"The cop didn't say get on the ground," one contractor said. "He just kept shooting."