TUNIS, Tunisia — Tunisia's National Bardo Museum is open to the public again for the first time since extremist gunmen opened fire on foreign tourists earlier this month, killing 22 people in the country's worst attack on civilians in 13 years.

The government says the man considered the "operational chief" of the assault was killed in a security raid Saturday. Two gunmen were killed the day of the March 18 attack in Tunis.

The Bardo reopened Monday, including sections damaged by the attack. The country's largest museum, it is renowned for richly colorful Roman mosaics. It houses 8,000 works, and is a top destination for European cruise ship passengers and other tourists.

The attack was a blow to Tunisia's fledgling democracy and its tourism industry.