He also admitted he had joined in mixing fuel oil with another substance at a Queens garage in which the authorities say a bomb was being made.

Mr. Salem's role as an informer emerged publicly within a day of the June 24 F.B.I. raid on a Queens garage.

In addition, videotapes showed four defendants mixing diesel oil and fertilizer at a Queens garage for the intended bombs.

But those recordings, as well as a videotape showing several defendants mixing diesel fuel and fertilizer in a Queens garage, provided strong evidence of the bombing plot.

Then, the transcripts show, the agents reconsidered the informer's argument and told him they would replace the timer in the Queens garage from which they had earlier filched it.

A man and a woman were found dead inside a parked car in a Queens garage early yesterday, having apparently inhaled carbon monoxide fumes by accident, the authorities said.

In late June, Mr. Salem, an Egyptian, led Federal agents to a Queens garage, where several of the men said to be mixing explosive chemicals.

He was even kind enough to rent a Queens garage for the task.

Even the Government acknowledged at the most recent trial that the bomb the defendants were building in a Queens garage would never have exploded.

Investigators last night found the body of a Brooklyn woman reported missing last month buried under the concrete floor of a Queens garage, the police said.

He also admitted he had joined in mixing fuel oil with another substance at a Queens garage in which the authorities say a bomb was being made.

Mr. Salem's role as an informer emerged publicly within a day of the June 24 F.B.I. raid on a Queens garage.

In addition, videotapes showed four defendants mixing diesel oil and fertilizer at a Queens garage for the intended bombs.

But those recordings, as well as a videotape showing several defendants mixing diesel fuel and fertilizer in a Queens garage, provided strong evidence of the bombing plot.

Then, the transcripts show, the agents reconsidered the informer's argument and told him they would replace the timer in the Queens garage from which they had earlier filched it.

A man and a woman were found dead inside a parked car in a Queens garage early yesterday, having apparently inhaled carbon monoxide fumes by accident, the authorities said.

In late June, Mr. Salem, an Egyptian, led Federal agents to a Queens garage, where several of the men said to be mixing explosive chemicals.

He was even kind enough to rent a Queens garage for the task.

Even the Government acknowledged at the most recent trial that the bomb the defendants were building in a Queens garage would never have exploded.

Investigators last night found the body of a Brooklyn woman reported missing last month buried under the concrete floor of a Queens garage, the police said.