During the 1990s, there was still much frustration among tribal groups, namely in the Nandi, Nakuru, Uasin-Gishu, and Trans-Nzoia Districts, where under Kenyatta's government they had not regained the land taken by European settlers and more of it had been sold to those regarded as "foreigners"—Kenyans from other tribes. Among these groups there were widespread calls for restitution and in 1991 and 1992 there were violent attacks against many of those who obtained land through Kenyatta's patronage in these areas. The violence continued sporadically until 1996, with an estimated 1500 killed and 300,000 displaced in the Rift Valley.