Investigators got a tip that the suspect was planning to fly to the Dominican Republic and contacted the authorities on the island.

That is a tactic used when authorities think a suspect might be planning to flee, though Dr. Waksal's lawyers say he never had that intention.

The second suspect, John Norris, who was arrested today, planned the reconnaissance and murder missions, the indictment said.

Or a suspect may be formulating an explanation of events that lessens his culpability, planning an alibi, or thinking through his options.

Israeli security officials said the suspects had been planning to blow up an apartment building in Jerusalem.

The six suspects were allegedly planning to carry out a series of terrorist attacks in Karachi and other parts of Pakistan.

They seized pipe bombs that they said the suspects were planning to use to blow up a subway station.

The official, who spoke on condition of anonymity, said authorities believed the suspects were planning to blow up as many as 10 planes.

The authorities seized a cache of pipe bombs, which, they said, the suspects planned to blow up on a crowded subway station and a bus.

The arrest came shortly before presidential elections, and the suspects had planned to found a Christian political party.