US Calls for Calm After Iraqi Government Forces Seize Kirkuk

Officials in Iraq say it's safe for thousands of Kurds to return to Kirkuk after federal forces took back control of the city and nearby oilfields; more than a-thousand people have taken part in a vigil in Malta for a journalist murdered on Monday by a powerful car bomb; and the collision of two dead stars has been watched for the first time by an international team of researchers.