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The heartbreaking death of a 2-year-old Kentucky girl who was shot and killed Tuesday by her 5-year-old brother with a rifle he had been given as a gift might lead to criminal charges.

The Lexington Herald-Leader writes that "Kentucky State Police said Wednesday it is too early to say whether charges will be filed in the case of a 5-year-old boy who accidentally shot and killed his 2-year-old sister."

(Most recent update: 4:36 p.m. ET.)

Three 19-year-old men — two of them University of Massachusetts Dartmouth college students from Kazakhstan who were friends with Boston bombings suspect Dzhokhar Tsarnaev — were taken into custody Wednesday by authorities in Boston. The third individual, an American citizen, was also a student at the University of Massachusetts Dartmouth, where Tsarnaev was enrolled.

We're due for one of those rare moments Thursday morning when the current president and all of his living predecessors will be together.

The occasion: The dedication of the George W. Bush Presidential Library and Museum on the campus of Southern Methodist University in Dallas. Presidents Jimmy Carter, George H.W. Bush, Bill Clinton and Barack Obama are due to be there along with, of course, George W. Bush.