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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Abdulmutallab has been known to federal authorities for at least two years and had been on a terror watch list compiled by the U.S. National Counterterrorism Center.

联邦机构已经掌握Abdulmutallab的情况有2年的时间了，并将其列在美国国家反恐中心的恐怖观察名单上。

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US grand jury has indicted Nigerian Umar Farouk Abdulmutallab on six counts over an alleged plot to bomb a plane over Detroit on Christmas Day.

一个美国大陪审团控告尼日利亚人乌马·霍鲁·阿卜杜勒六项罪名，他曾密谋在圣诞节当日炸毁飞往底特律一架班机。

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from Europe with a valid entry visa. Umar Farouk Abdulmutallab's name should have come up on a computer screen.

VOA: standard.2009.12.28

President Obama said Umar Farouk Abdulmutallab should have been on a list of individuals banned from U.S.flights.

VOA: standard.2009.12.29

The group in Yemen, al-Qaida in the Arabian Peninsula, is believed to have ties with Umar Farouk Abdulmutallab, the Nigerian man accused of trying to blow up a U.S.passenger jet on December 25.

VOA: standard.2010.01.07

On November 20, a State Department cable to Washington on AbdulMutallab -- based on the information from his father -- lacked any mention of his visa, the officials said.

CNN: State Department failed to confirm terror suspect's visa

The father's information was vetted and a determination on how to proceed was made through a U.S. inter-agency process, and a file was opened on Abdulmutallab about five weeks ago.

CNN: STORY HIGHLIGHTS

Authorities have focused their investigation on how AbdulMutallab, 23, allegedly smuggled the explosives aboard the flight and who might have helped him.

CNN: STORY HIGHLIGHTS