The Washington Times - April 23, 2013, 08:57AM

The senior Democrat on the House intelligence committee says evidence suggests the Boston Marathon bombers acted alone.

“At this time the evidence that we have in the briefings that I have personally received don’t show any third parties,” said Rep. C.A. “Dutch” Ruppersberger of Maryland told CNN’s “Starting Point” program. “But there’s still a more more to investigate.”

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The lawmaker, a longtime member of the House Permanent Select Intelligence Committee, says investigators are particularly interested in how the bombing suspects — brothers Dzhokhar and Tamerlan Tsarnaev — learned to make the two homemade explosive devises that killed three and injured more than 170 on April 15.

“Al Qaeda puts out a magazine they call [‘Inspire’] that literally gives directions on how to make the type of bombs that were used here,” he said.

Mr. Ruppersberger added that investigators say it seems like the suspects used a cell phone to trigger the bombs. “Now that takes a little bit more sophistication,” he said.

Intelligence community officials are scheduled to hold a close-door briefing with members of Congress Tuesday afternoon, Mr. Ruppersberger said.