The heightened security comes after a 23-year-old Nigerian man, Umar Farouk Abdulmutallab, allegedly tried to detonate explosives on a Northwest Airlines plane December 25 as it approached Detroit.

美国加强机场安全措施是因为23岁的尼日利亚男子阿卜杜勒穆塔拉布涉嫌在12月 25日试图在西北航空公司飞机飞行接近底特律时引爆炸药。

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U.S.authorities have charged the suspect, Umar Farouk Abdulmutallab, with transporting and attempting to detonate explosives aboard an airliner .

VOA: standard.2009.12.27

The terrorists who bombed three suburban trains in Madrid in 2004, killing 191 people and injuring nearly 2, 000, used their mobile phones to detonate the explosives.

ECONOMIST: When everybody becomes a nomadic monitor

And agents searched his rental car and laptop computer while he was there, turning up what they said were handwritten notes of his explaining how to make, handle and detonate explosives, according to the affidavit.

CNN: Terror suspect: 'Our phone call is being monitored'

Reid's shoes allegedly contained several bomb-related materials including the explosive PETN, plastic chemicals to gel and mold the explosives and TATP, a highly sensitive material needed to detonate the shoe bombs, sources told CNN.

CNN: Judge denies bail to accused shoe bomber