In a message written on a wall of the boat where he was found hiding, Boston bombings suspect Dzhokhar Tsarnaev claimed responsibility for the attack and said it was motivated by anger over the Afghan and Iraq wars, sources familiar with what was found have told CBS News correspondent John Miller.

Louisville is being singled out this week by two national magazine in a project meant, in large part, to spotlight economic innovation being undertaken throughout the U.S. 

Marie Porter was child of the Civil Rights movement. She was raised in the west Louisville, and at the age of 11 was one of the first African-Americans to integrate into a predominantly white school.

In 1961, as a high school student, she took part in “Nothing New For Easter,” during which she and others refused to purchase clothing from stores that practiced racial discrimination.

That year, and into 1962, Marie Porter took part other demonstrations, marches and sit-ins that occurred on Fourth Street.

GRANBURY, Texas — Officials say at least six people were killed when a spring tornado outbreak devastated parts of North Texas, destroying or damaging dozens of homes and injuring dozens of people.

The worst-hit city Wednesday was Granbury, where authorities say the fatalities occurred as the deadly tornado tore through two neighborhoods. Hood County Sheriff Roger Deeds delivered the death toll at a midnight news conference and said dozens were injured.

Tomorrow marks a dreary anniversary in Louisville.

On the afternoon of May 17, 2012, two men—Craig Bland Jr., 22, and Tyson Mimms, 24—died in a fatal shootout in the Parkland neighborhood. As multiple police officers investigated on the 1000 block of South 32nd St., a second brazen shooting happened yards away. Makeba Lee, 24, died. The woman now accused of murdering her, Cheetara Goldsmith, was shot by a Louisville Metro Police officer.

President Obama announced late Wednesday that the acting commissioner of the Internal Revenue Service, Steve Miller, has resigned in the wake of a report that employees at the agency engaged in partisan scrutiny of conservative groups seeking tax-exempt status.

The president, appearing for a brief statement at the White House, said he had directed Treasury Secretary Jack Lew "to accept the resignation of the acting commissioner of the IRS."

Kentucky Derby winner Orb has drawn the rail in Saturday's Preakness and has been installed an overwhelming even-money favorite in the nine-horse race.

Orb will seek to keep alive his bid to become horse racing's first Triple Crown winner since Affirmed in 1978. Orb won the Derby by 2½ lengths as the betting favorite. The brown colt is looking for his sixth straight victory as part of the smallest Preakness field since 2007.

Govenor Charlie, trained by Bob Baffert, was added to the list Wednesday for the 1 3/16th-mile race.

A measure to stop the Army Corps of Engineers from restricting access to the Cumberland River near locks and dams is moving through Congress.

Senate Minority Leader Mitch McConnell added the amendment to a water resources bill that passed the Senate today.  In a news release, McConnell said restricting access to the water directly below dams would have a devastating effect on fishermen and the local economy.

A scholarly publisher has issued a warning to Jeffrey Beall, a librarian who writes about what he calls "predatory" practices in the scholarly publishing industry, threatening him with a $1 billion lawsuit for his blog posts criticizing the company.

Beall is an academic librarian at the University of Colorado; he writes about the journal industry on his personal blog, Scholarly Open Access.

Scintillating isn't how you'd describe the report issued by the Treasury inspector general's report on the Internal Revenue Service's targeting of conservative groups.

It was written, after all, by government bureaucrats for government bureaucrats. Enough said.