Governor R S Mooshahary, Home Minister H D R Lyngdoh, Congress chief D D Lapang, CnRD Minister Saleng Sangma and Parliamentary Secretary Abdus Saleh have also been given Z category security, a senior political department official said today.
Militants had twice targetted CnRD Minister Sangma.
Congress working president and former Deputy CM Deborah Marak, who was attacked by militants in her constituency last month, was placed under Y-category along with Leader of Opposition Conrad K Sangma and 21 other legislators.
Seventeen other MLAs have been given X-category security cover together with Chief Secretary W M S Pariat.
Meanwhile, DGP Kulbir Kishan said he was touring the five militant-hit Garo Hills district this week to see if re-calibration of strategy was required for peaceful Assembly elections due next year.
Two militant groups, the GNLA and ANVC-B, were active in the area, compelling the state government to assess the need to deploy additional forces during the elections.