Radio, TV cut off ties with Pakistan

From March 4 of 1971, the radio station played patriotic songs of Rabindranath Tagore and Kazi Nazrul Islam. During the ongoing countrywide hartal on March 3 and March 4, six people embraced martyrdom in Khulna in army attack. In Chattogram (erstwhile Chittagong), the death toll rose to 121 in two days.
Bangabandhu Sheikh Mujibur Rahman increased the hartal
    period, calling for hartals on March 5 and March 6, from 6:00am to 2:00pm on March 4.
"As the non-cooperation movement launched by Bangabandhu Sheikh Mujibur Rahman was on full-swing, the state-run Radio Pakistan in Dhaka started broadcasting as Dhaka Betar Kendra on March 4 in 1971. The state-run Pakistan Television was also renamed Dhaka Television while both radio and television artistes, expressing solidarity, announced that as long as the countrymen and students continue to struggle for freedom they will not perform in any programme for Pakistan," Banglapedia said.
Bangabandhu directed those state-run and private offices which were yet to pay salaries to remain open from 2:30pm to 4:00pm so that employees could collect salaries.
Dhaka University Teachers Association and 55 teachers of the university in separate statements condemned the anti-people role of the then Pakistan Observer newspaper on March 4.
That same day, amid military attack on Bangalees and Gen Yahya Khan's refusal to visit East Pakistan, Sahibzada Yaqub Khan resigned from his posts of governor of East Pakistan and martial law administrator. Gen Tikka Khan was to then take over as the governor of East Pakistan.
Bangabandhu Sheikh Mujibur Rahman, in a speech, greeted and congratulated the countrymen for responding to his call with demonstrating courage and standing up against repression and misrule.
"Without immense sacrifice, no country has ever achieved independence," Bangabandhu said.
Wikipedia said Air Marshal (Retd) Asghar Khan in Karachi urged that power be immediately handed over to Sheikh Mujibur Rahman and his party Awami League for achieving majority and in order to save Pakistan.
The junta in Rawalpindi appeared to root about for an answer to the problem, but did not exactly know how to go about doing it. As days passed, the crisis kept deepening further.
According to US Embassy's communication (which was published later), at least one Pakistani Air Force C-130 had been seen flying into Dhaka and there were recurrent reports that forces were being flown into Dhaka via Pakistani commercial airline and of the movement of troops from the West via ship.
"It is known that there is pressure from some elements in the military to make a quick repressive strike against the East Pakistan leaders in hopes of cowing them and the rest of the province, " according to Liberation War Museum, Bangladesh Genocide Archive.