AlQa'dah 18, 1432, Oct 16, 2011, SPA -- Kenyan troops moved over the border into Somalia Sunday, after top Kenyan ministers pledged soldiers would hunt down gunmen suspected of kidnapping four Europeans in recent weeks, including two humanitarian aid workers, dpa reported. Kenya's government blames the Somali al-Shabaab militia for the kidnappings. The abduction of two Spaniards working for charity Medecins Sans Frontieres (MSF) on Thursday appears to have spurred Nairobi into penetrating its neighbour's territory. Several senior Kenyan officials say their country is now at "war" with al-Shabaab, citing the right to self-defence in going after the militia. Military sources quoted by local media indicated one plan being considered was the creation of a buffer zone inside Somalia. Kenyan troops, backed by aerial support, were said to have crossed 100 kilometres into the northern neighbour. In recent weeks, Nairobi has deployed hundreds of troops to the border region, fearing fighting between the sides could spill over into its own territory. -- SPA