Body found after explosion rips roof off Newburyport pharmaceutical plant

"Why are we allowing companies to continue to operate knowing that there's a laundry list of these kinds of concerns already brought to their attention?" said Al Vega, chief of strategy and engagement at Massachusetts Coalition For Occupational Safety And Health, or MassCOSH.

"Because these hazards are so well known and the potential controls for them are so well known, when an incident like this occurs, the criminal charges ought to be investigated,” said Richard Rabin, senior trainer and technical consultant to MassCOSH. “Especially a company that repeatedly violates the standards, repeatedly puts workers' health and lives at risk.