DACCA, Pakistan, Nov. 4—The Government today reported a sharp increase in Bengali guerrilla activity in: the last 24 hours, including the sinking of a large oil tanker in the East Pakistani port, of Chittagong.

Seven crewmen were reported missing in the attack, made upon the tanker as it was about to sail for Dacca. The guerrillas have been regularly blowing up gasoline and fuel supplies to hamper the Pakistani Army, and they have sunk or damaged at least a dozen ships.

According to Government reports, guerrillas also assassinated a leading Dacca lawyer, Mudabbir Hossain, shooting him in his home, and robbed two banks here of about $5,000.

In addition, the Government said, guerrillas set off three large bombs at a power station, caving Dacca and two nearby towns without electricity for most of the day.

Lack of power yesterday created a water shortage in Dacca, the capital of East Pakistan, and many residents were forced to find wells. Electric power in Dacca and elsewhere in East Pakistan has been progressively disrupted by sabotage to the point at which there are half a dozen stoppages here every day.

It has now been more than seven months since the army began its crackdown in East Pakistan on the Bengali autonomy movement, and nearly every day these days there, is skirmishing between troops or policemen and guerrillas “in Dacca itself, generally with casualties.

Outside the city, government defenses depend mainly on the so‐called razakars, a semi-trained militia.

Razakar volunteers, posted at, bridges and other military strongpoints, are prime targets of the guerrillas, and for this reason they are understood to be armed only with bolt action rifles and no more than five cartridges each.

Arming razakars with machine guns or other automatic weapons would enable the guerrillas to capture these weapens.

In another development related to security, the Pakistani Government charged today that half a million Indian troops were now massed along the frontier for invasion.

The Indian and Pakistani Governments have each repeatedly declared that they would not initiate an attack, but war scares continue and both sides have made elaborate preparations.

Dacca scheduled an air raid drill for tonight in which persons caught showing a light would be subject to six months imprisonment.

Most foreign military analysts tend to discount the likelihood of general war between Pakistan and India. Instead, India is considered likely to continue helping guerrillas in East Pakistan; especially by keeping the Pakistan Army pinned down along the long frontiers of both West and East Pakistan.