In news on Syria, Human Rights Watch says Syrian government forces have used chemical nerve agents, such as sarin gas, in attacks at least four times in recent months, including in the April attack on a town that killed 86 people, including dozens of children. Human Rights Watch also says new evidence, including photos and videos of weapon remnants, suggests the April attack came from a Soviet-made, air-dropped chemical bomb specifically designed to deliver sarin. One of the other attacks, on December 12, reportedly killed 64 people. The Syrian government denies using chemical weapons, including in the April attack. Meanwhile, U.S.-led coalition airstrikes continue in Syria. The journalistic monitoring group Airwars says these airstrikes reportedly killed at least two dozen civilians in the final week of April in and around Raqqa. U.S.-led coalition airstrikes also continue in Mosul, Iraq, where dozens of civilians were killed by airstrikes launched by the coalition or the U.S.-backed Iraqi Army in the final week of April.