Policemen guard stand near a blood stain at the entrance of the Bardo museum in Tunis, Tunisia, Thursday, March 19, 2015, a day after gunmen opened fire killing over 20 people, mainly tourists. One of the two gunmen who killed tourists and others at a prominent Tunisian museum was known to intelligence services, Tunisia’s prime minister said Thursday. But no formal links to a particular terrorist group have been established in an attack that threatens the country’s fledgling democracy and struggling tourism industry. (AP Photo/Christophe Ena)
