Khulshi Police Station Inspector (investigations) Sukanta Chakraborty said they were detained while sticking posters at Chittagong Veterinary and Animal Sciences University on Friday morning.
Among those arrested, Ishtiaque Hossain, 25, is a student of the Chittagong University of Engineering and Technology while Ahsan Ali Mia, 24, studies at Government Commerce College.
Abdul Zawad, 22, sat HSC exams this year from the city’s Ispahani Public School, Chakraborty said.
“They were pasting posters against the Indian prime minister’s visit and the state. Students nabbed them and informed police,” he told bdnews24.com.
He added police recovered scores of ‘anti-state’ posters from them.