A vehicle carrying US Ambassador Marcia Bernicat was also attacked by "armed men" but she escaped unscathed, the embassy said. Ambassador to Bangladesh Marcia Bernicat was returning from dinner at the time of the attack. The July 29 accident brought tens of thousands of uniformed students out on the roads calling for a crackdown on reckless drivers amid overall transport sector reforms.
Protesters say that the protests were peaceful when suddenly the police used tear gas.
Local media reported that political activists belonging to the governing party beat students marching towards their offices.
Bangladesh's 'Awami League Government' has made several attempts to stop the protest of students running for a week but the movement is still in progress.
The US ambassador condemned the violence.
Bangladeshi expatriates have been thoroughly vocal about their support regarding the student protests taking place in the capital as well as the rest of the country.
"There is no justification whatsoever for detaining anyone for exclusively peacefully expressing their views", Omar Waraich, Amnesty's deputy South Asia director, said in a statement.
How has the governing party responded?
Shahidul Alam, a well-known photographer and activist, was arrested on Sunday by plain-clothed police after giving a television interview in which he said Prime Minister Sheikh Hasina has no credibility and was using "brute force" to cling to power.More news: War Of Credibility Over Rick Gates Continues In Paul Manafort Fraud Trial
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"Everything has an optimum point, and if anyone crosses the limit, action will be taken.so don't cross the limit", home affairs minister Asaduzzaman Khan said. "We'll continue our movement until we get such an assurance", said a student at Shahbagh intersection.
How have the protests unfolded?
Last weekend, after a speeding bus struck and killed two students in Dhaka, Bangladesh, their peers began to pour into the streets to demand justice.
Defying government warnings to end the protests, some university students on Monday threw bricks at police and others tried to take processions through the city.
"But we fear the movement may turn violent as there is a conspiracy to.make the government inoperative".
Over the past two days, unidentified men in helmets carrying sticks and metal rods have attacked protesters and journalists.
Activists have also taken to social media in droves to call on local and global media organisations to cover the story.
Witnesses have told the BBC that anyone found filming the clashes, including journalists, have been beaten and had their equipment destroyed.
Meanwhile, telecommunications companies were ordered to suspend 3G and 4G services for a period of 24 hours on late Saturday.
"We won't leave the roads until our demands are met. we want safe roads and safe drivers", protester Al Miran told The Telegraph.