The New York Times reports: The Tunisian authorities have arrested more than 20 people in the investigation into Wednesday’s attack at the National Bardo Museum in Tunis, including 10 the authorities say were directly tied to the deadly assault, a spokesman for the Ministry of the Interior said Saturday.

Some of those detained are relatives of the two gunmen who opened fire in the museum, killing 20 foreign tourists and three Tunisians before being shot dead by security forces.

The government and security forces have acted rapidly to investigate the attack and to present a determined and united front against terrorism, calling on all Tunisians and other countries to show solidarity. “There is a large-scale campaign against the extremists,” the ministry’s spokesman, Mohamed Ali Aroui, told news agencies.

Yet legislators and members of the public are already raising questions about security failures that allowed the gunmen to gain access to the museum so easily. [Continue reading…]