News time twelve nineteen eighty degrees. Mostly sunny skies in Boston. Good afternoon. I'm art Cohen WBZ news. Our top stories now the communities in the Merrimack valley are returning home today. Hard at work picking up the pieces after Friday's gas explosions, the National Transportation Safety board says the cause of the incident may take up to two years to nail down. But right now, it does not look like it was caused intentionally amid the cleanup in Lawrence a fire broke out in a three story residents on diamond street. Authorities say thirty say it is not related to the gas incident.