What to know this morning: In 5 minutes or less

1. ISIS militants have likely killed up to 500 Iraqi civilians, sending thousands fleeing from their homes as the city of Ramadi fell to the extremist group, officials said Monday. Read more here.

2. Amtrak has resumed service on the Northeast Corridor from Washington to Boston, almost a week after the deadly crash. The first train, a 5:30 am southbound train left New York's Penn Station on time. Read more here.

3. President Obama has tightened regulations on weapons police officers are allowed to carry -- prohibiting some military-style equipment that had formerly been given to local departments. Read more here.

4. Last night's Billboard Music Awards were a big night for Taylor Swift who took home eight trophies, becoming the most decorated star in Billboard history with 20 wins. Read the full list of winners here.

5. Former NFL linebacker Adrian Robinson died Saturday night at the age of 25, according to the Philadelphia Inquirer. Read more here.

6. 35 years ago today, a 5.1 earthquake triggered the eruption of Mount St. Helens, located in southwest Washington state. 57 people lost their lives, and it is now a world-class outdoor laboratory for the study of volcanoes. Read more here.