RSS man held in blast case.     KOZHIKODE: An activist owing allegiance to the right wing Rashtriya Swayam Sevak Sangh (RSSS) was arrested Sunday in connection with a bomb explosion at Koyilandi in Kozhikode. Police said Joshiram (23), hailing from Dharmadom in Kannur, was arrested in the afternoon. His rented house at Maramukkam Street near Koyilandi was damaged in the blast yesterday. His mother, who sustained serious injuries in the blast, is battling for life in Kozhikode Medical College.