The Bangladeshi government has declared an indefinite curfew in in six cities after unrest at several universities. The military-backed interim administration has also ordered students to vacate their dormitories.
The emergency measure comes after violent disturbances in which was one man was killed and around 300 injured.
The protests, over the presence of the army on campus, erupted at Dhaka university and spread to other cities.
Troops had been based in the Dhaka campas since January when an interim administration took power after months of political violence in the country.
The soldiers were withdrawn on Tuesday but it failed to prevent further trouble.
The students, who want a ban on political activity at universities lifted, are being supported by some opposition parties.