MUMBAI, June 17 -- The Uddhav Thackeray-led Shiv Sena (UBT) is staring at a possible split in its Lok Sabha unit as some of its lawmakers are likely to form a separate group, akin to the split in the Mamata Banerjee-led Trinamool Congress. Leaders of the Eknath Shinde-led Shiv Sena said six MPs from the rival Sena (UBT) are likely to form a separate group and submit a letter to Lok Sabha Speaker Om Birla. They will then merge with the Sena's Lok Sabha unit, Sena insiders said. P9...