The West is increasingly at risk for attacks from ISIS and those inspired by it as countries cope with returning militants and alienated locals.
The damage is almost equivalent to the entire GDP of the U.S. island territory of Guam.
McGowan was kidnapped along with a Swede and Dutch national, both of whom have already been released.
Former U.K. ambassador to Saudi Arabia William Patey blasted Saudi Arabia’s “unhealthy” Salafi-Wahhabi Islam, saying it could promote extremism.
Five Kalashnikovs and a pistol were seized during the raid.
"He signs papers, he reads, he consults, he's actually very busy."
Defining what terrorism is can be contentious but over the years scholars have identified several distinct waves.
The Trump administration continues to focus on combating Islamist extremists, overlooking the bigger problem of right-wing terrorism.
Several Singaporeans have been arrested in recent weeks for trying to reach ISIS in Syria and Iraq.
The conflict in the southern Philippines has been raging for more than a month, despite President Duterte's assurances it would be over in three days.
Duterte had previously warned the international community from "meddling" in the Philippines' affairs.
The Group to Support Islam and Muslims bragged about killing Westerners and attacking "a site of debauchery"
They fear that new groups will join the conflict after Eid al-Fitr.
Pakistan is refusing to take sides in the diplomatic dispute between Saudi Arabia and Qatar, but has agreed to take certain steps to defuse tensions.
Decades of terrorism in Africa show that heavy-handedness is not the solution to a rising militant threat.
The traditional strategy of "contain and negotiate" in hostage situations been scrutinised after "lone wolf" attacks.
Trump's son claimed CNN and other media outlets staged a protest of Muslims condemning ISIS.
The war has lasted for 14 days in the southern island of Mindanao.
Behind the rapid response is years of training and lessons learnt from attacks in other major cities.