Violence involving BJP-RSS and ruling CPI(M) workers rocked politically volatile Kannur district in north Kerala on Saturday with a number of houses and shops of rival leaders and workers being attacked over the Sabarimala issue.

Bombs were hurled at several places, including at the houses of CPI(M) MLA A N Shamseer in Madapeedikayil, BJP leader and Rajya Sabha member V Muraleedharan at Vadiyil Peedikia and former Kannur district secretary of CPI(M) P Sasi at Thalassery past midnight, police said.