Jordanian soldiers stand guard at the Iraq-Jordan border last year. Jordan also shares a border with Syria and has had to deal with a flood of refugees from both its neighbors over the past decade. Jamal Nasrallah/EPA/Landov hide caption

itoggle caption Jamal Nasrallah/EPA/Landov

Demonstrators chant anti-Islamic State group slogans and carry posters with pictures of Jordanian King Abdullah II, late King Hussein and slain Jordanian pilot, Lt. Muath al-Kaseasbeh, during a rally in Amman, Jordan. Nasser Nasser/AP hide caption

itoggle caption Nasser Nasser/AP

Mourners pray during a ceremony for Jordanian pilot Muath al-Kaseasbeh, who was killed by the Islamic State after he was captured in December. At Wednesday's service, which took place in the city of Karak, mourners called for the destruction of ISIS. Khalil Mazraawi/AFP/Getty hide caption

itoggle caption Khalil Mazraawi/AFP/Getty

Saif al-Kaseasbeh (dressed in black), father of Jordanian pilot Muath al-Kaseasbeh, sits with senior officers of Jordan's military Wednesday at the headquarters of his family's clan in the city of Karak. Kaseasbeh is calling for revenge against ISIS for killing his son. Muhammad Hamed/Reuters/Landov hide caption

itoggle caption Muhammad Hamed/Reuters/Landov

Supporters of Jordanian pilot Lt. Muath al-Kaseasbeh hold posters of him that read, "We are all Muath," during a protest in Amman, Jordan, on Tuesday. Raad Adayleh/AP hide caption

itoggle caption Raad Adayleh/AP

Relatives of Jordanian pilot Lt. Muath al-Kaseasbeh, who was captured by ISIS militants in Syria, protest Tuesday in front of the royal palace in Amman, Jordan. Jordan has suggested it might be willing to hold a prisoner exchange for his release. Jamal Nasrallah/EPA/LANDOV hide caption

itoggle caption Jamal Nasrallah/EPA/LANDOV

Relatives of Jordanian pilot Lt. Muath al-Kaseasbeh, who was captured by ISIS militants in Syria, protest in front of royal palace in Amman, Jordan, Tuesday. Jordan has suggested it might be willing to hold a prisoner exchange for his release. JAMAL NASRALLAH/EPA /LANDOV hide caption

itoggle caption JAMAL NASRALLAH/EPA /LANDOV

Safi al-Kasasbeh and his wife Saafia are the parents of Moath al-Kasasbeh, the Jordanian air force pilot captured by the self-proclaimed Islamic State in Syria. The worried parents are proud of their son, but say Jordan should not be involved in the coalition against ISIS. Alice Fordham/NPR hide caption

itoggle caption Alice Fordham/NPR

Lebanese clown Sabine Choucair, a member of "Clowns Without Borders," performs for children in June at a Syrian refugee camp in the eastern town of Chtoura, Lebanon. Bilal Hussein/AP hide caption

itoggle caption Bilal Hussein/AP

A photo released by the U.S. Navy shows the guided-missile cruiser USS Philippine Sea launching a Tomahawk cruise missile against Islamic State targets in Syria on Tuesday. Eric Garst/U.S. Navy/EPA/Landov hide caption

itoggle caption Eric Garst/U.S. Navy/EPA/Landov

Syrian refugees stand in line for food at Kawergost refugee camp in Irbil, Iraq, on Aug. 21. The Syrian civil war has already sparked a refugee crisis in the region. Now, many countries are waiting to see the effects of a possible U.S. military strike. Hadi Mizban/AP hide caption

itoggle caption Hadi Mizban/AP

Jordanian protesters chant slogans against corruption during a March 15 anti-government demonstration in Amman. Jordanians have held Arab Spring-inspired protests since 2011, demanding political reforms and anti-corruption measures. The protests have been peaceful. Khalil Mazraawi/AFP/Getty Images hide caption

itoggle caption Khalil Mazraawi/AFP/Getty Images