Police and firefighters rushed to 35 Gatehouse Drive after a minor release of hydrofluoric acid in one of the labs in the building around 9:53 a.m. The building is mostly occupied by Astrazeneca Pharmaceuticals, Waltham Fire Lieutenant Scott Perry said, but he wasn’t sure who owned the lab where the spill happened.

A state hazardous materials response team along with firefighters cleared the scene and deemed the building safe by 1:57 p.m., according to Perry.

*Original article online at https://www.bostonglobe.com/metro/2019/03/19/chemical-spill-lab-sends-hospital-waltham/gSfZx1g2NejsW2EzM0nCXI/story.html