Civil wars

A Sri Lankan police officer patrols out side a mosque in Colombo, Sri Lanka, Wednesday, April 24, 2019. The Islamic State group has claimed responsibility for the Sri Lanka attacks on Easter Sunday and released images that purported to show the attackers. Prime Minister Ranil Wickremesinghe said that investigators were still determining the extent of the bombers' foreign links. (AP Photo/Eranga Jayawardena)

FILE - In this Oct. 16, 2006, file photo, a Sri Lankan soldier inspects the debris at the site of a suicide explosion by Tamil Tigers near Dambulla, about 150 kilometers (90 miles) northeast of Colombo, Sri Lanka. The April 21, 2019 deadly Easter attacks in Sri Lanka are a bloody echo of decades past in the South Asian island nation, when militants inspired by attacks in the Lebanese civil war helped develop the suicide bomb vest. Over nearly 30 years of civil war, the Tamil Tigers would launch more than 130 suicide bomb attacks, making them the leading militant group in such assaults at the time. (AP Photo/Eranga Jayawardena, File)

Relatives place flowers after the burial of three victims of the same family, who died at Easter Sunday bomb blast at St. Sebastian Church in Negombo, Sri Lanka, Monday, April 22, 2019. Easter Sunday bombings of churches, luxury hotels and other sites was Sri Lanka's deadliest violence since a devastating civil war in the South Asian island nation ended a decade ago. (AP Photo/Gemunu Amarasinghe)

A Sri Lankan man walks across a deserted street during a curfew in Colombo, Sri Lanka, Sunday, April 21, 2019. More than two hundred people were killed and hundreds more injured in eight blasts that rocked churches and hotels in and just outside Sri Lanka's capital on Easter Sunday. (AP Photo/Eranga Jayawardena)

Dead bodies of victims lie inside St. Sebastian's Church damaged in blast in Negombo, north of Colombo, Sri Lanka, Sunday, April 21, 2019. More than two hundred people were killed and hundreds more injured in eight blasts that rocked churches and hotels in and just outside Sri Lanka's capital on Easter Sunday. (AP Photo/Chamila Karunarathne)

FILE - In this May 1, 2010 file photo, then Sudanese President Omar el-Bashir greets his supporters during a rally at a fair in Khartoum, Sudan. A Sudanese official and a former minister said Wednesday, April, 17, 2019, that the military has transferred ousted President Omar al-Bashir to the city's Kopar Prison in Khartoum. The move came after organizers of the street protests demanded the military move al-Bashir to an official prison. (AP Photo/Abd Raouf, File)

This photo combination shows Associated Press journalists, from left, videographer Maad al-Zikry, reporter Maggie Michael and photographer Nariman El-Mofty. The team won the 2019 Pulitzer Prize in international reporting for their work documenting torture, graft and starvation in Yemen's brutal civil war. (AP Photo)

Staff of the South Florida Sun Sentinel celebrate their bittersweet honor Monday, April 15, 2019, in Deerfield Beach, Fla., after winning the Pulitzer Prize for Public Service. The newspaper won for its coverage of the Parkland school shooting. (Carline Jean/South Florida Sun-Sentinel via AP)

FILE-- In this Sept. 24, 2017 file photo, surface-to-surface missiles and a portrait of the Iranian Supreme Leader Ayatollah Ali Khamenei are displayed by the Revolutionary Guard in an exhibition marking the anniversary of outset of the 1980s Iran-Iraq war, at Baharestan Square in Tehran, Iran. On Monday, April 8, 2019, the Trump administration designated Iran’s Revolutionary Guard a “foreign terrorist organization” in an unprecedented move against a national armed force. Iran’s Revolutionary Guard Corps went from being a domestic security force with origins in the 1979 Islamic Revolution to a transnational fighting force. (AP Photo/Vahid Salemi, File)