Bangladeshi police have fired tear gas to disperse tens of thousands of students protesting for an eighth day to demand safer roads after two teenagers were hit by a bus.
The proximate cause of the protests was the death of two young students who were crushed under the wheels of a racing bus near on Airport Road in Dhaka.
Protests have flared repeatedly in Dhaka since two students were killed last week by speeding buses.
The protesters stopped trucks, buses and cars, demanding to see the licenses of drivers and check if vehicles were in roadworthy conditions.
Asked what the police would now do, Dhaka Metropolitan Police (DMP) Commissioner Asaduzzaman Mia said: "We have taken all necessary steps to control the law and order situation".
Earlier, the US Embassy expressed its support to the protesters by saying that "nothing can justify the brutal attacks and violence over the weekend against the thousands of young people, who have been peacefully exercising their democratic rights in supporting a safer Bangladesh".
The US embassy confirmed an official vehicle "was attacked by a group of armed adult men" but the envoy and her team departed unharmed.
And on Monday, Bangladesh police said they arrested a prize-winning photographer Shahidul Alam for "provocative comments" in an Al Jazeera interview about the protests, seen by some as a free-speech crackdown.
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The students of Jadavpur University raised slogans against Bangladesh Prime Minister Sheikh Hasina and burnt her effigy.
A vehicle carrying United States ambassador Marcia Bernicat was also attacked by "armed men" but she escaped unscathed, the embassy said.
"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.
With the protest movement nearly entirely driven by young people, its unsurprising that social media has played a key role, in both spreading the initial news about the two killed as well as in organising the demonstrations. Traffic laws are poorly enforced and the students blame the private bus network for mishaps in a city choked by massive traffic jams.
Witnesses say police fired rubber bullets and tear gas canisters at demonstrators.
Police sources said the DMP has already collected a huge number of photos and other documents, by which they have identified the men throwing stones at police to be members of Jatiyatabadi Chhatra Dal Islami Chhatra Shibir, student members of the BNP and Jamaat-e-Islami, respectively.
"Our demand is that the owners must appoint them and they will work a maximum of 10 hours".