RAWALPINDI, Pakistan, March 6 (Reuters)—Followers of Sheik Mujibur Rahman expect him to declare the independence of East Pakistan at a rally tomorrow despite the efforts of President Agha Mohammad Yahya Khan to prevent a secession.

President Yahya warned against secession in a broadcast to the nation last night and said the postponed session of the new National Assembly would open March 25.

“No matter what happens, as long as I am in command of Pakistan's armed forces and head of state, I will ensure the complete and absolute integrity of Pakistan,” he declared. “I will not allow a handful of people to destroy the homeland of millions of innocent Pakistanis.”

East Pakistani political leaders alleged that Government troops had killed hundreds and wounded thousands of unarmed civilians in quelling agitation in the state.

Tajuddin Ahmad, general secretary of Sheik Mujibur's Awami League, which holds a majority of seats in the new Assembly, issued a statement last night condemning Government troops for their “reprehensible conduct.”

Assails Eastern Leaders

President Yahya in his broadcast accused East Pakistani leaders of reacting to his postponement of the Assembly session, which was to have begun last Wednesday, in a manner “which resulted in destructive elements coming out into the streets and destroying life and property.”

The President recalled that he had invited all parties in the Assembly to a conference next Wednesday in a bid to reconcile the differences between East and West Pakistani leaders over the country's future constitution. Sheik Mujibur rejected the invitation.

The President charged that since national elections were completed in December, “practically every step I took in the process of the transfer of power has in one way or another been obstructed by some of our leaders.”

In the first national elections since Field Marshal Mohammad Ayub Khan took power under martial law in 1958, Sheik Mujib's Awami League won 167 of the Assembly's 313 seats. In the west, the People's party of Zulfikar Ali Bhutto won 81 seats.

2 Leaders Split

But the two party leaders’ failed to come to terms in pre-Assembly consultation as Sheik Mujib demanded virtual autonomy for the east under the new constitution. When Mr. Bhutto decided to boycott the Assembly, President Yahya postponed the session.

Gen. Yahya, who replaced Marshal Ayub as President after nationwide riots in March, 1969, has given the Assembly 120 days to draft a new constitution for a return to civilian rule. But he warned he would not accept one that would weaken the unity of the two parts of Pakistan. Under such circumstances martial law would continue, he said.

The two wings of Moslem Pakistan were carved out of the Indian subcontinent in 1947 when predominantly Hindu India achieved independence. The two parts of Paidstan are separated by 1,000 miles of Indian territory.

West Pakistan is economically more prosperous than the eastern wing but the latter has 56 per cent of the total population and produces most of the country's jute—a major foreign currency earner.