1.   There were police helicopters above, scanning the highways, and scuba teams below, checking for underwater mines.

2.   Among those taking part are five American-trained dolphins used for locating underwater mines.

3.   Initial reports indicated the simultaneous explosions came from underwater mines, Rear Adm. Cecil Tissera, the naval chief of staff, said in an interview.

4.   Initial reports indicate the simultaneous explosions came from underwater mines, Rear Adm. Cecil Tissera, the naval chief of staff, told The Associated Press.

5.   Rear Adm. Cecil Tissera, the naval chief of staff, said underwater mines apparently touched off the simultaneous blasts.

6.   Rear Adm. Cecil Tissera said underwater mines apparently touched off the simultaneous blasts.

7.   The attackers were believed to have set off underwater mines.

8.   The guerrillas also died in the attack, believed to be set off by underwater mines.

9.   The sub could have myriad uses, whether to comb for underwater mines, conduct scientific research or hunt for wreckage from airplane crashes.

10.   They were trained to detect underwater mines and enemy swimmers and retrieve torpedoes.