The Occupational Safety and Health Administration (OSHA) has determined that a deadly explosion at a pharmaceutical chemical plant in Massachusetts could have been prevented. The explosion at the Seqens plant in May resulted in the death of a worker and significant damage to the building. OSHA's investigation found that Seqens and its subsidiary, PolyCarbon Industries Inc., lacked safeguards in the chemical-making process and had deficiencies in their safety management program. The companies have been cited with 11 violations, including eight serious ones, and face nearly $300,000 in penalties. The plant has a history of safety issues, including previous explosions and violations. Local authorities and lawmakers are calling for accountability and improved safety measures.