He is the most senior security official to be killed by Boko Haram so far.
The weapons they used were also thought to have originated in Libya, the security official said.
Reuters quoted an unnamed security official as saying the pilot had ejected from the aircraft.
Mr. Clarke was a national security official in the White House for three presidents.
Algerian authorities believe the attackers entered the country from Libya, a senior Algerian security official said.
" Says one senior Indian security official: "Let's see what they will do now.
At a third stand-off, at a Jewish centre, seven hostages had been released, a security official said.
He and another security official had come at the request of the Jamaican government, an official said.
No flights in or out of Phnom Penh were expected on Monday, an airport security official said.
One security official from the Massachusetts Institute of Technology, Sean Collier, was killed in the gun fight.
The attack took place in al-Adhaim, 60 kilometers (37 miles) north of Baquba, a Diyali security official said.
Canavan is the second security official at the FAA to leave his post since the September 11 terrorist hijackings.
According to a Homeland Security official, Metro buses and trains will be swept for explosives starting at 4 a.m.
As you know, wherever he goes he travels with a national security official.
The security official with the Anti-Extremism Center, a federal agency under Russia's Interior Ministry, confirmed the Russians shared their concerns.
Greg Rothwell, the top Homeland Security official overseeing the hurricane contracting, plans to retire at the end of next week.
Maxfield kept heading toward the finish only to be stopped by a security official trying to get her out of harm's way.
Egypt's state news agency quoted a top security official who said the gunmen were "jihadists" who had infiltrated from the Gaza Strip.
Both the investigator and the security official spoke on condition of anonymity because they were not authorized to talk to the media.
The security official said some trains traveling from Cairo were passing through.
Meanwhile, a disciplinary watchdog says a public security official in Guangdong used two fake hukou to invest in real estate, Beijing Times adds.
"The wave came onshore and washed out people's homes, " said Cinta Brown, an American Samoa homeland security official working at the island's emergency operations center.
CNN: Scores dead, villages flattened in devastating Samoan tsunami
Last month, a senior Libyan security official told CNN the government was aware of Libyans fighting in Syria, but they were individuals and not government sponsored.
An hour later, the governor's wife of 46 years was called by a security official, who said one of the officers wanted to talk with her.
CNN: In Missouri, Carnahan's widow vows to carry on husband's fight
An Algerian security official told Associated Press the Algerian government was discussing with the US and France whether an international force could help end the stand-off.
Also Sunday, in Iraq's Diyala province, at least four people were killed and 17 others wounded in several attacks, a security official in the province said.
Adil's camera was nearly snatched out of his hands by another zealous and eagle-eyed security official who had spotted us filming from his third floor watch-station.
An Egyptian security official quoted by AP news agency said the shipment had been made in consultation with Israeli officials who were in Cairo on Thursday.
Cairo (CNN) -- Kidnappers in Egypt have released two Americans and their Egyptian tour guide after holding them hostage for three days, a security official said Monday.
But even if he meets all of them it is not clear that the violence will cease, says a senior Turkish security official in a border province.
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