The incident occurred on August 1, 2012, when the CPM called a state-wide protest against the arrest of then CPM district secretary P Jayarajan in connection with the Ariyil Shukoor murder case. According to the prosecution, DYFI workers Nishad and Nandakumar, along with two others, A Mithun and K V Kripesh, arrived on two motorcycles in Payyannur and hurled a country-made steel bomb at a police jeep
