Two of the gunmen involved in an attack on a popular museum in Tunisia Wednesday -- which left 21 dead, including 17 tourists -- have been captured and one may still be at large, the country's Ministry of the Interior said.

The gunmen had opened fire on the National Bardo Museum in Tunis earlier Wednesday. Authorities said at least 21 people were killed, including 17 tourists. At least 21 people were wounded, according to a Fox News source in Tunis.

Tunisian Prime Minister Habib Essid had said earlier Wednesday that two or three other gunmen had escaped and were possible at large.

Essid told national television that people from Poland, Italy, Germany and Spain were among the tourists.

Poland's Foreign Ministry announced that three Poles were among the wounded while the Italian Foreign Ministry said at least two Italians were wounded and 100 other Italians had been taken to a secure location.

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An unknown number of tourists were also taken hostage. But Tunisia’s interior ministry said the hostage standoff ended after security forces stormed the museum and killed two of the gunmen. A security officer and a cleaning woman were also killed in the raid.

Tunisia's parliament building, near the museum, was evacuated during the standoff, according to a tweet by parliament member Sayida Ounissi.

The interior ministry said tourists were taken hostage by “two or more terrorists armed with Kalashnikovs.” Private radio station Radio Mosaique said the attackers were dressed in military-style clothing.