concerns. news4's megan mcgrath is live outside metro headquarters downtown with more on what's being discussed. megan, good morning. >> well, good morning, barbara. metro safety committee has been investigating several different incidents and they released their findings to the board this morning. we know the cause behind the bus fires involving the orion 6 models. we know the cause of an april derailment at the rosalyn metro station. buses roll off the metro lot in northwest and into service this morning. but more than 90 buses continue to stand idle. the orion 6s were pulled off the street after two of them suddenly burst into flames while out on the road. this incident in prince george's county was caught on a cell phone camera. just days earlier, there was a similar fire in fairfax county. so what's going on with the orion 6s? >> the high pressure, hydraulic bypass hose fitting was not installed properly. >> reporter: different hoses were involved in each fire.