At least four people were killed and 600 suffered injuries after former prime minister Khaleda Zia's 18-party alliance supporters and their ruling party rivals and policemen fought pitched battles in Dhaka and elsewhere Sunday.
"Two hundred to 250 opposition activists with acting secretary general of Bangladesh Nationalist Party (BNP) Mirza Fakhrul Islam Alamgir were sued in the first case," a police official told Xinhua Monday.
In the second case, "200 to 300 opposition men with Mirza Abbas, a standing committee member of BNP, were sued", he said.
After the end of the eight-hour blockade of Sunday, Alamgir denied responsibility for the violence.
The BNP, however, has unveiled large-scale protest plans including the road blockade to force Prime Minister Sheikh Hasina's government to meet its demand, mainly the restoration of a non- party caretaker government to hold next general elections slated for early 2014.