Sophie Flay has the details on the elementary school shooting in Bend, Oregon, where the community is in mourning after police say a gunman killed four people, including three children. Police say he first shot into a truck before firing through the school’s locked doors to get inside. Plus, election officials and lawmakers are on high alert after suspicious letters containing a white powder were mailed to Capitol Hill and across the country. And sources tell ABC News that President Trump is weighing whether to drop the largest non-nuclear bomb in the U.S. arsenal on Iran.

00:28: BEND OREGON SHOOTING: Police say a 16-year-old killed 3 students and 1 teacher at Silver Rail Elementary School.
01:21: SUSPICIOUS LETTERS: Authorities say they are investigating suspicious letters sent to Capitol Hill and across the country.
01:53: ‘MOTHER OF ALL BOMBS’: Sources tell ABC News that President Donald Trump is weighing whether to drop the so-called "mother of all bombs" on Iran.
02:31: WHITE HOUSE PRESS SECRETARY: Katie Zacharia confirmed that she failed the bar exam the first and only time she took it.
02:53: NO EXECUTION LIVESTREAM: President Trump has called off the plan to livestream Nidal Hasan’s execution.
03:17: PHILADELIPHIA BONES: Bones have been recovered from a home at the center of an investigation into seven missing women, according to WPVI.
04:04: DOJ SUES TICKET BROKER: The Justice Department is suing Reps & Co., accusing the company of illegally buying concert tickets and making millions in resale profits.
04:34: A.I. ALLEGEDLY DELETES SHOW’S SEASON: A Swedish reality show allegedly lost an entire season after an A.I. agent deleted their material.
05:17: TESLA ROADSTER: The company has unveiled its new car that uses compressed air to take flight.

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