The North's Supreme Court sentenced him last week for unspecified "hostile acts" against the state.
North Korea charged the reporters with illegal entry into the country, "hostile acts" and spying.
North Korea has threatened to launch missiles and South Korea has vowed to retaliate against hostile acts.
"South Korea's military is on high alert to prepare for any hostile acts, " ministry spokesman Mr. Kim said.
An air marshal is an undercover armed guard on board a commercial aircraft to counter hijackings and other hostile acts.
When warranted, the United States will respond to hostile acts in cyberspace as we would any other threat to our country.
FORBES: The White House and Pentagon Deem Cyber-Attacks "An Act of War"
On Sunday, North Korea said Seoul should stop "all the hostile acts and military provocations" if it seeks to reopen the complex.
And today, U.S.-imposed sanctions and being placed on America's list of states that sponsor terrorism are considered hostile acts by North Koreans.
"We consider such trafficking as hostile acts and will hold the Syrian government accountable for such shipments, " Rumsfeld said at a Pentagon briefing.
"South Korea's military is on high alert to prepare for any hostile acts from the North following the guided-missile launches today, " defense ministry spokesman Mr. Kim said.
State media said the Supreme Command of the Korean People's Army issued an ultimatum demanding an apology from South Korea for "hostile acts" and threatening that unspecified retaliatory actions would happen at any time.
"Clinton expressed words of sincere apology to Kim Jong Il for the hostile acts committed by the two American journalists against the DPRK after illegally intruding into it, " North Korea's state-run KCNA news agency reported.
"If the puppet authorities truly want dialogue and negotiations, they should apologize for all anti-DPRK hostile acts, big and small, and show the compatriots their will to stop all these acts in practice, " the statement said, referring to North Korea's official name.
Yet a new UN resolution, which was passed unanimously by the 15 members of the Security Council ordering Iraq to accept the return of weapons inspectors, does state that no hostile acts should be carried out while they are in the country.
Mr Ashcroft said there was legal authority "under the laws of war and clear Supreme Court precedent, which establishes that the military may detain a United States citizen who has joined the enemy and has entered our country to carry out hostile acts".
The conditions were abysmal, as they often are for opening acts: the houselights were up, the crowd was alternately inattentive and hostile.
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