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Update at 8:44 p.m. ET. Authorities Make An Arrest:

Authorities have made an arrest in connection to the suspicious envelopes sent to a senator and President Obama.

The FBI identified the suspect as Paul Kevin Curtis.

The The Clarion Ledger reports:

Grammy-winning gospel singer George Beverly Shea died in Asheville, North Carolina last night after a brief illness. He was 104.

"The wife of a former justice of the peace is being held on a capital murder charge in the killings of the Kaufman County District Attorney, his wife and a top prosecutor," The Dallas Morning News reports.

American Airlines has promised passengers that Wednesday's flight schedule will be nothing like the day before, when thousands were stranded due to a glitch in the reservations system that forced hundreds of flights to be canceled or delayed.

American Airlines and American Eagle scuttled 970 flights and delayed more than 1,000 others Tuesday, The Associated Press said, citing flight-tracking service FlightAware.com.

By a vote of 77 to 44, lawmakers in New Zealand have passed a new law permitting same-sex marriage. The bill was adopted after its third reading and is to take effect in August, according to the New Zealand Herald.

Pat Summerall was the "voice of football and always will be," longtime broadcasting partner John Madden said Tuesday.

Good morning, here are our early stories:

-- Boston Marathon Explosions: Wednesday's Developments.

-- For Thatcher, 'A Great Calm' After A Life Of Controversy.

And here are more early headlines:

The daily lowdown on books, publishing, and the occasional author behaving badly.

Margaret Thatcher, the prime minister whose time leading Great Britain in the 1980s brought joy to conservatives and despair to liberals, was remembered Wednesday for "a life lived in the heat of political controversy."

With her death last week at the age of 87, "there is great calm" for the Iron Lady, added the bishop of London, the Right Reverend Richard Chartres, during a funeral service at London's St. Paul's Cathedral.

(Note at 7:50 a.m. ET, April 18: We've begun a new post to track Thursday's developments.)

Investigators made progress Wednesday, as they tried to determine who planted two bombs near the finish line of the Boston Marathon, leaving three people dead and injuring about 180.