LONDON, Sunday, June 13— A Pakistani journalist who ac companied the West Pakistan Army when it crushed the insurrection in East Pakistan charged today that the troops had “deliberately massacred” the people of East Bengal.

Anthony Mascarenhas, assist ant editor of The Karachi Morning News, was one of eight Pakistani reporters allowed by the military government to visit East Pakistan in April, about two weeks after two army divisions had been flown in He gave up his home and job in Pakistan, arranged for his family to leave the country, and flew here to write his account for The Sunday Times of London.

According to Mr. Mascarenhas, the newsmen who visited East Pakistan were permitted to report only the mutiny of East Pakistani troops on March 25 and 26 and the atrocities committed against non‐Bengalis. The reporters were not allowed to describe the army's action against the rebels, or even to mention the danger of famine, he related.

Mr. Mascarenhas wrote that the Pakistani Government has suppressed “the second and worse horror which followed when its own army took over the killing.”