The acid and other chemicals found in the basement of a Boston building Tuesday evening were being stored to make fish oil supplements, Boston Fire officials say.
The chemicals were found as part of some type of laboratory around 6 p.m. in the basement of Fenway Market on Kilmarnock Street, near Fenway Park, Boston Police Commissioner William Evans said.
A hazardous materials team was investigating as well as the FBI's Joint Terrorism Task Force.
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Several neighboring buildings in the city's Fenway neighborhood were evacuated after the discovery of the possible lab, police said. A shelter was being set up for evacuees.
Evans said lots of acid and a "heating" device were found in the building's basement as part of a routine inspection by the city's Inspectional Services Department. Officials add that an entrance and exit to Fenway Market were also blocked.
There were no permits for the making of supplements.
Boston police confirmed earlier that first responders were investigating calls of flammable liquids at 76 Kilmarnock St.
Crowds at the Boston Red Sox game that started at Fenway Park just after 7 p.m. may need to be redirected if the situation is ongoing, police said.
Road closures in the area includes Kilmarnock Street, Park Drive and Boylston Street. Police were asking drivers to seek alternative routes.
Businesses and restaurants in the area also closed down for the night due to the incident.
No one has been cited yet, but that could happen.