But when journalists rushed to cover the explosions, they were beaten up by Sramik League (Awami League's labour front) activists who were manning a side of the street to keep strikers at bay.
Police rescued the journalists, said Bongshal Police Station SI Khoda Newaz.
Private television channel ATN Bangla senior cameraperson Kabirul Islam Pintu told bdnews24.com the Swechchasebak Dal exploded several hand bombs from the procession around 9am on Monday.
Journalists from ATN Bangla, NTV, Bangla Vision, Channel i and Daily Janakantha rushed to cover the explosions, he said.
Sramik League activists who were positioned on one side of the road chased away the supporters of Swechchasebak Dal and then pounced on the journalists.
They beat up some TV channel reporters blaming the explosions on their presence.
SI Khoda Newaz said police rescued crew of ATN Bangla, NTV and Channel I immediately.