Sudan has closed its border with Ethiopia on concern that clashes in a northern region of the neighbouring country may spread, a move aimed at stopping fighters in Ethiopia’s Tigray region from crossing the frontier. Bloomberg reports that there have been few details on the intensity of the clashes so far, after the government shut down communications networks in the region but two foreign diplomats briefed on the violence said they have received reports of heavy fighting in three areas that have caused dozens of casualties, while German news agency Deutsche Welle reported that the army conducted airstrikes on locations around the Tigrayan capital, Mekelle, on Thursday.