Boston. At this point, fire officials tell us there is no concern for the surrounding area, no concern over a leak or a spill. We got an update from a fire. We transported a couple of people. A couple of them have been airlifted into boston. At this time, we are waiting for the hazmat teams to go in and prepare the scene for us. Sera we are getting conflicting reports on how many people injured. North andover says four people, we are getting reports of five with three airlifted to boston. They are working on determining what caused the explosion. State Emergency Management team. Employees have walked out and not commented. We have been told we will get an update from authorities at some point. Live in north andover, sera congi, Wcvb Newscenter 5. Jc some of those workers hurt were taken to lawrence general hospital. Three were then airlifted to boston hospitals. Newscenter 5 s john atwater is live in lawrence tonight, john . John doctors described injuries as serious blast energy and v