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			 Security video footage showed the gunman pull out the 
			.45-caliber pistol, raise it and point it across the aisle before 
			putting it back against his side, authorities told the San Francisco 
			Chronicle (http://bit.ly/1crPYQc) in a story on Monday. 
 			The man drew the gun several more times and once wiped his nose with 
			the hand holding the weapon.
 			"These weren't concealed movements -- the gun is very clear," 
			District Attorney George Gascon said. "These people are in very 
			close proximity with him, and nobody sees this. They're just so 
			engrossed, texting and reading and whatnot. They're completely 
			oblivious of their surroundings."
 			Authorities declined a request by The Associated Press for the 
			surveillance footage, citing an ongoing investigation. 			
			 
 			San Francisco police officials say people who pay too much attention 
			to digital technology are also vulnerable to theft.
 			"Oftentimes when you interview people who get their phones stolen, 
			when you ask them to describe where the person came from, what he 
			was wearing, they have no idea," said police Chief Greg Suhr. 
			
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			Nikhom Thephakaysone, 30, has pleaded not guilty to charges 
			including murder in the Sept. 23 attack on Justin Valdez, 20, a 
			student at San Francisco State University who was shot in the back 
			of the head as he left the train.
 			Thephakaysone also has been charged with assault with a 
			semi-automatic handgun. Prosecutors said he stuck a handgun in 
			another man's back earlier the same night he shot Valdez as he 
			looked for a victim.
 			He did not pull the trigger and went on the hunt again for a victim 
			for more than an hour, at one point waving a gun outside a Thai 
			restaurant, Assistant District Attorney Scot Clark has said.
 			He was also charged with illegally possessing an assault weapon 
			after police said they seized two such rifles, combat knives and 
			razors at his home.
 			Police said he was carrying $20,000 in cash when he was arrested. [Associated 
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