#WorldNewsTonight #DavidMuir #News #abcNews br After four people were killed and a fifth was injured in a mass shooting at a Midtown Manhattan office building on Monday, Aaron Katersky reports on what police say about the gunman's history of mental illness and the off-duty police officer who is among the dead; With over 170 million across the nation under heat alerts, Mola Lenghi reports on the life-threatening heat from Nebraska to Florida to the Northeast; Juju Chang has the latest on the massive 8.7 magnitude earthquake off the coast of Russia, prompting tsunami warnings for Alaska and Hawaii, and putting the entire west coast including California on a tsunami watch; Rachel Scott has details on what Pres. Trump told reporters convicted sex offender Jeffrey Epstein "stole" workers from his Mar-a-Lago resort, acknowledging some of them were young women; and more on tonight’s broadcast of World News Tonight with David Muir.