About 100 Americans have joined Islamic State group abroad, the Obama administration announced on Monday.
The three officers were found at a Canadian border crossing 450 miles away from the U.S. base where they were training.
The airstrikes left an undetermined number of people dead and wounded in the town of Arsal on the Lebanese border.
“Airpower is a major component of this to be sure, especially with the new weapons available to us,” Blair said.
Two countries with the rockiest relationships are considering collaborating with the international community to fight the Islamic State group.
The United States is building an international coalition to combat the radical Sunni Muslim group.
The incident was one of the most significant breaches at the White House since Obama became president in 2009.
Kerry and Iranian Foreign Minister Mohammad Javad Zarif also discussed the threat posed by Islamic State militants.
Power said she would leave it to individual nations to announce their participation themselves.
The Ajnad Misr militant group claimed responsibility for the blast in a statement posted on its official Twitter account.
The hostages, including Turkey's consul-general, diplomats' children and special forces soldiers, were seized from the Turkish consulate in Mosul.
"I cannot see how it could assist any state's cause to allow the world to see a man like Alan dying," Henning's wife said.
The now-freed hostages said some among the group were injured in U.S. airstrikes, but the bombings likely save their lives.
A conversation between two Arabic speakers reportedly referred to a “demonstrative act, Wednesday, at the Vatican.”
The U.S. would give a reward for information to help catch militants involved in the beheading of journalists James Foley and Steven Sotloff.
Masoud Barzani, an Iraqi Kurdish leader, had called on international forces to stop the militant group's advance in Syria.
The 49 hostages, including Turkish diplomats and their family members, were captured by the Islamic State group in Mosul in June.
In Berlin, politicians and non-Muslims joined about a thousand faithful to protest against the radical Islamists.
ISIS released a documentary-style video all but inviting U.S. troops back to Iraq for a fight.
ISIS bombings in Baghdad Thursday and Friday suggest the militant Islamic State group has made new advances on the ground.
France became the first country to assist the U.S. with airstrikes against the Sunni militant group in Iraq.
Former U.S. President Bill Clinton said the Iraqi government's inclusiveness will help the U.S.-led effort to combat ISIS.