French troops have been fighting Mali's Islamist rebels in street battles in the town of Diabaly, Malian and French sources say. In the first major ground operation in the conflict, French special forces were fighting alongside Malian troops. Diabaly, 350km (220 miles) north of the capital Bamako, was captured by the rebels on Monday. France intervened in Mali last Friday to try to halt the Islamists' push southwards towards the capital. In a separate development, the chief prosecutor for the International Criminal Court opened a war crimes investigation, focusing on acts committed since January 2012 in some northern regions of...