Chemical explosion at Massachusetts industrial park leaves worker missing and multiple injured.

TL;DR
A chemical explosion occurred at an industrial park in Massachusetts, injuring four workers and leaving one unaccounted for. The cause of the explosion is unknown, and the building suffered major structural damage, preventing rescue crews from entering. The company Seqens, a contract drug substance manufacturer, is listed at the address.
- Worker missing, 4 hurt after chemical explosion at Massachusetts industrial park NBC News
- Newburyport explosion leaves one worker missing at pharmaceutical manufacturing company CBS Boston
- Newburyport chemical explosion: One worker missing; first responders, hazmat team on scene The Boston Globe
- Worker unaccounted for after 'violent explosion' at chemical plant in Newburyport, Massachusetts WCVB Boston
- Fiery explosion reported at chemical plant in Newburyport WCVB Channel 5 Boston
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