Mark Memmott

The day after two bombs exploded near the finish line of the Boston Marathon, investigators began to unravel some of the details of what happened, and we began to learn about the lives of the three people who were killed.

FBI Special Agent in Charge Richard DesLauriers said that they believed the devices used in the attack may have been pressure-cooker bombs stuffed with BBs and nails. Investigators said the bombs may have been left inside nylon bags or backpacks.

There's been a strong earthquake, with an estimated magnitude of 7.8, in southeastern Iran near the border with Pakistan, the U.S. Geological Survey reports.

The temblor was centered about 53 miles east southeast of the small city of Khash. According to USGS, it was about 9.4 miles deep.

Here's a fresh headline that may be welcome to those who oppose the bipartisan plan to extend background checks of gun purchasers to sales made at gun shows and over the Internet:

Walking a line meant to show both resolve and willingness to trust in diplomacy, Secretary of State John Kerry warned North Korea on Friday not to engage in more warmongering — but also said the U.S. is willing to talk with that communist state if it's serious about discussing denuclearization.

"No one is going to talk for the sake of talking," Kerry said, but the U.S. does want to see a peaceful resolution of the latest crisis on the Korean peninsula.

The first national gun control legislation since the Dec. 14 school shooting in Newtown, Conn., is going to be debated on the floor of the Senate and appears headed for a vote sometime next week.

Supporters in the Senate on Thursday morning rounded up more than the 60 votes necessary to clear a procedural hurdle that could have held up consideration of the Democratic-crafted package. The vote was 68-31 in favor of blocking a bid by some Republicans to filibuster the legislation.

North Korea's next provocative move — the test firing of a medium-range ballistic missile — could happen at any moment, according to South Korean officials.

Bloomberg Businessweek reports that "the possibility of a ballistic missile launch is 'very high' and 'may materialize anytime from now,' South Korean Foreign Minister Yun Byung Se told lawmakers in Seoul today."

By beating Michigan 82-76 Monday night in Atlanta, Louisville won this year's Division I men's basketball championship.

In winning:

If this is President Obama's "make-or-break week on guns," as Politico declares, then it starts with considerable confusion about where things stand regarding the likelihood of passing new gun control laws.

You have to give Louisville basketball player Kevin Ware credit. He's a really good sport.