WASHINGTON, Feb. 16 - ...Intelligence that "strongly suggests" that Al Qaeda operatives have considered using the Mexican border as an entry point was cited in written testimony [before Congress on Wednesday] by Adm. James M. Loy, the deputy secretary of homeland security. But he wrote that there was "currently no conclusive evidence" that this had succeeded.

In the past, law enforcement officials have said Al Qaeda might try to use the Mexican border, but the testimony on Wednesday seemed to suggest increasing concern. In response to questions from the senators, Admiral Loy described it as a "very serious situation,"...

In his written testimony, Admiral Loy cited recent information from investigations and detentions as the basis for his concern about the Mexican border. He added, "Several Al Qaeda leaders believe operatives can pay their way into the country through Mexico and also believe illegal entry is more advantageous than legal entry for operational security reasons."