Mark Memmott

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.

Thursday morning's economic news:

-- There were 360,000 first-time claims for unemployment insurance last week, up 32,000 from the week before, the Employment and Training Administration says. At 360,000, the pace was the fastest since the last week of March. But it remained well below the 400,000-and-higher rate that lasted from mid-2008 into 2011.

"The head of Saudi Arabia's religious police has warned citizens against using Twitter, which is rising in popularity among Saudis," the BBC reports. "Sheikh Abdul Latif Abdul Aziz al-Sheikh said anyone using social media sites — and especially Twitter — 'has lost this world and his afterlife.' "

International Digital Times notes that:

"CAPTURED!"

That's how the New Orleans Police Department spread the word on Facebook early Thursday that its officers had "arrested 19-year-old Akein Scott in connection with the shooting of 19 people on Mother's Day."

Update at 4:05 p.m. ET. Second Suspect Arrested:

Early casualty reports indicate that a powerful suicide car bombing Thursday in Kabul killed at least seven Afghan civilians, four foreign civilian contractors who were working for international forces and two members of the international military force.

Dozens more people were reportedly injured by the blast in Afghanistan's capital city.

"A massive emergency response" is underway in North Texas, where tornadoes blew through Wednesday night, The Dallas Morning News says. A twister that hit Granbury, about 35 miles southwest of Fort Worth, left at least six people dead, more than 100 injured and even more homeless, The Associated Press adds.

Update at 6:42 p.m. ET: Reaction From Boehner's Office

In a statement, Brendan Buck, a spokesman for House Speaker John Boehner, said the emails "contradict statements made by the White House that it and the State Department only changed one word in the talking points."

Here's the statement in full:

He doesn't want to know who's going to resign, House Speaker John Boehner, R-Ohio, told reporters Wednesday morning.

He wants to know: "Who's going to jail" for what IRS personnel did to some conservative groups?

All branches of the U.S. military have been ordered "to retrain, re-credential and rescreen all sexual assault prevention and response personnel and military recruiters," the Pentagon confirmed Wednesday morning.

Saying that their client is not a "monster," attorneys for Ariel Castro have told Cleveland's WKYC-TV that the man accused of kidnapping three young women, holding them captive and repeatedly raping them over the course of about a decade will plead not guilty to all charges if he is indicted by a grand jury.

The language is not dramatic, but the message is clear: A much-anticipated report from the Treasury Department's inspector general for tax administration is straightforward about how Internal Revenue Service personnel unfairly singled out some conservative groups for unnecessary scrutiny during the 2012 campaign cycle.

As the report's summary says:

As his Justice Department faces bipartisan outrage for searching phone records of Associated Press reporters and editors, Attorney Gen. Eric Holder says he is not sure how many times such information has been seized by government investigators in the four years he's led Justice.

During an interview with NPR's Carrie Johnson on Tuesday, Holder was asked how often his department has obtained such records of journalists' work.

Attorney Gen. Eric Holder has ordered the Justice Department to open an investigation into whether any laws were broken when the Internal Revenue Service singled out some conservative groups for extra scrutiny, he told reporters Tuesday.