They had been called by local residents worried about the safety risk from explosives which were being stored at the compound for use as evidence in trials.

BBC: NEWS | Americas | Guatemala secret files uncovered

Regulations for consumer fireworks are overseen by the Consumer Product Safety Commission, while the Bureau of Alcohol, Tobacco, Firearms and Explosives regulates commercial pyrotechnics used in public July Fourth displays and the like.

WSJ: Range of Laws Govern Retail Fireworks Purchases