Execution investigation and other headlines

Image: Firefighters and rescue personnel work along the tracks where several CSX tanker cars carrying crude oil derailed

Oklahoma officials refuse to say if they tried to revive Clayton Lockett. (Tulsa World)

Where the oil tanker train that derailed yesterday was going, and why environmentalists have been concerned since December. (Daily Press)

The Transportation Dept. sent new rail safety rules to the White House for review last night. (NY Times)

2 inmates dead after an ‘apparent gas explosion’ at a county jail in Florida. (Pensacola News Journal)

Speaker Boehner’s ‘just ribbing’ apology apparently not accepted by some conservative House members. (Politico)

GOP presidential hopefuls met with donors on the sly. (AP)

Top 2 Pentagon intelligence officials quitting. (AP)

U.S. officials say Syria is using remaining chemical weapons stockpile as leverage. (Washington Post)

Toronto mayor Rob Ford takes leave of absence after more drug allegations. (Toronto Sun)

What are you reading this morning? Leave links in the comments, please.