Via Newsday/AP, from suburban New Jersey:

A woman wearing a T-shirt with the words "President Bush You Killed My Son" and a picture of a soldier killed in Iraq was detained after she interrupted Mrs. Bush's speech.

Police escorted Sue Niederer of Hopewell out of the rally after she demanded to know why her son, Army 1st Lt. Seth Dvorin, 24, was killed in Iraq. Dvorin died in February while trying to disarm a bomb. Niederer was later charged with defiant trespass and released.

As shouts of "Four More Years" subsided, Niederer, standing in the middle of the crowd of about 700, continued to shout about the killing of her son. Local police escorted her out of the event, handcuffed her and placed her in the back of a police van.

The first lady continued speaking, and several people shouted back at Niederer. One woman yelled, "Your son chose to fight in that war."

Here is an interview with Sue Niederer. She is a member of Military Families Speak Out.

The NY Times story tells us one of the things she yelled:

The mother of a soldier killed in Iraq was arrested after interrupting a speech by Laura Bush in Hamilton, N.J. Mrs. Bush appeared before a crowd of more than 700 people at the Colonial Fire Hall, trumpeting President Bush's efforts to fight terrorism and stimulate the economy with tax cuts. When she made reference to the war in Iraq, she was interrupted by a spectator, Sue Niederer, who shouted, "Why don't your children serve?'' Mr. Bush's supporters quickly surrounded Ms. Niederer, who wore a shirt bearing a photo of her son, Seth Dvorin, an Army lieutenant killed in Iraq in February, and the words "President Bush, You Killed My Son." As Bush supporters shouted "Four more years!" and Mrs. Bush resumed her speech, security guards led Ms. Niederer from the auditorium. Later, as Ms. Niederer stood near the doorway to the fire hall being interviewed by reporters, she refused a request to leave the premises and was arrested on charges of trespassing.

Common Dreams has an image of her protesting at a Colin Powell appearance in February.