Tunis, July 2 (IANS) Four Tunisian soldiers were killed Wednesday in a landmine blast in the **rthwestern part of the country, a media report said. The explosion occurred when the soldiers were carrying out a sweeping operation on a military vehicle in the mountai**us region of Kef, Xinhua quoted sources as saying. On Tuesday, Four soldiers and two national guard ******rs were injured in a landmine explosion during a sweeping operation in the same area.