A military spokesman on Saturday confirmed the names of the four fighters implicated in the attack on the upscale Westgate Mall in Kenya’s capital last month, an assault that turned into a four-day-long siege, killing at least 67 people. Major Emmanuel Chirchir said the attackers were Abu Baara al-Sudani, Omar Nabhan, Khattab al-Kene and Umayr, names that were first broadcast by a local Kenyan television station.