Bangladesh Prime Minister Sheikh Hasina urged students to go home on Sunday as police fired tear gas at teenage protesters during an eighth day of unprecedented demonstrations over road safety which have paralysed parts of Dhaka.
Students in their tens of thousands have brought parts of the capital to a standstill since two teenagers were killed by a speeding bus.
The unrest quickly spread beyond the capital. Authorities have shut down mobile internet services across swathes of the country, officials and local media said.
On Saturday the protests took a violent turn in Dhaka’s Jigatala neighbourhood, with more than 100 people injured as police fired rubber bullets at demonstrators.
A car carrying US ambassador Marcia Bernicat was also attacked by "armed men" but she escaped unscathed, the embassy said.
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The violence continued Sunday with police firing tear gas into a large crowd marching toward an office of the ruling Awami League party, an AFP correspondent said.
Dozens of protesters were attacked by people alleged to be ruling party activists, some armed with machetes, in Dhaka’s Dhanmondi neighbourhood.
Twelve were treated at Dhaka Medical Colleague Hospital, police inspector Bacchu Mia told AFP.
A photographer for an international news organisation was among those beaten.
Mrs Hasina warned Sunday that a "third party" could sabotage the protests and put the safety of demonstrators at risk.
"That’s why I request all guardians and parents to keep their children at home. Whatever they have done is enough," the prime minister said from her office.
Mrs Hasina also pledged to bring order to the roads, saying: "Our police force has started a week-long drive to bring discipline on the roads."
Mrs Hasina’s warning came as protesters marched towards the scene of Saturday’s clashes chanting: "We want justice!"
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Police denied they fired rubber bullets or tear gas at the protesters Saturday. However hospital staff said dozens of people had been injured, some seriously, and injuries were consistent with rubber bullets.
The Awami League has denied that its officials beat up students.
On Saturday, US ambassador Bernicat’s vehicle was set upon by a mob.
"As she was leaving about 11pm and getting into her car, a group attacked her car," said rights activist Badiul Alam Majumder, who was hosting the ambassador for dinner.
The US embassy confirmed an official vehicle "was attacked by a group of armed adult men" but the envoy and her team departed unharmed.
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The country’s biggest-circulation newspaper Prothom Alo said 3G and 4G internet services have been shut down for 24 hours since late Saturday, shortly after the violence broke out.
Social media has been filled with comments from Bangladeshis unable to access the internet via their phones, although wireless and wired networks appear to be unhindered.
The Bangladesh Telecommunications Regulatory Commission said it would comment later Sunday.
A senior telecoms official who asked for anonymity said: "The BTRC has slowed down the internet at the order of the government."
The move may be an attempt to limit the ability of students to mobilise or express growing online anger at how the government has handled the protests, hours after police and unidentified men wielding sticks and stones clashed with students.