abc's carolyn costello is live with details. >> good morning, reena and t.j. still unclear who is responsible for this attack and this morning people are asking could something like this happen here at home? the gunmen armed with assault rifles opened fire at a crowded museum in tunisia's capital. security forces scrambled to respond as tourists inside the museum ran for safety. >> several shots were fired. we found another couple with their children. we didn't know what to do so we hid. >> reporter: at least 0 people were killed including two gunmen and many more injured. most of the vics were tourists from poland germany, japan, spain and italy. shot as they got off a tour bus that brought them to the museum from a cruise ship. tunisia's parliament building was put on lockdown as lawmakers sang the country's national anthem. ♪ tunisia's prime minister called the act cowardly. first lady michelle obama traveling in japan expressed condolences. >> i want to join in with the others to express our condolences over the horrific event yesterday in tunisia. >> repo