The Saudi intelligence tip helped to head off what could have been a devastating series of plane explosions. Western officials credit the Saudis with playing a crucial role in finding two mail bombs recovered last week in Dubai and Britain before they reached the U.S…

The Saudi tip in October contained no mention of cargo planes, or any details of the plot carried out last week, said U.S. officials, speaking on condition of anonymity to discuss classified matters. But they said it gave the U.S. and other Western officials enough of a warning to know what to look for when another Saudi tip arrived last week.