1.  The Customs Service and CIA also began to fly smaller Citation surveillance aircraft to help Peruvian pilots intercept small planes.

2.  Peruvian pilots had believed the plane was on a drug smuggling flight.

3.  But the officials say the American crew plane urged the Peruvian pilot not to open fire because of mounting evidence the aircraft was innocent.

4.  But the American crew urged the Peruvian pilot not to open fire because of mounting evidence the aircraft was on an innocent civilian flight, the officials say.

5.  But the officials say the American crew urged the Peruvian pilot not to open fire because of mounting evidence the aircraft was innocent.

6.  But the American crew urged the Peruvian pilot not to open fire because of mounting evidence the aircraft was flown by drug smugglers, the officials say.

7.  U.S. officials have said the CIA crew urged the Peruvian pilot not to open fire because of mounting evidence the aircraft was innocent.

8.  Under the revised plan, Colombian and Peruvian military pilots would retain the right to shoot down suspect aircraft.