Boston Marathon bombing suspect Tamerlan Tsarnaev bought two mortar kits at a New Hampshire fireworks store in February, the fireworks company president tells the Herald.

“He bought two ‘Lock and Load’ mortar kits,” Phantom Fireworks President Bruce J. Zoldan told the Herald, “and the reason he selected that one is because he asked, ‘What’s the most powerful item you sell in your store?’ ”

Tamerlan Tsarnaev, killed Friday in a gunfight with police, took advantage of the store’s “buy one, get one free” sale, Zoldan said, and paid $200 in cash for the kits — and the 48 shells that came with them.

“We have a copy of his drivers license but not the video surveillance,” Zoldan said, because too much time had lapsed between the purchase and last week’s bombings, which killed three people and injured more than 200 others.

Zoldan said his staff looked through sales receipts after learning about the gruesome bombing. When they discovering the sale, they alerted the FBI.

“It’s a sad day for me,” Zoldan said about the news that his company’s product was sold to the suspected bomber. “I started this company with the idea of helping Americans celebrate the Fourth of July and the freedoms we have in this country.”