Authorities have image of bombing suspect

In Hopkinton, people held hands in a vigil near the Boston Marathon starting line Wednesday.

Wendy Maeda/Globe Staff

In Hopkinton, people held hands in a vigil near the Boston Marathon starting line Wednesday.

A banner in Hopkinton with a message of support for victims of the finish line bombings.

Wendy Maeda/Globe Staff

A banner in Hopkinton with a message of support for victims of the finish line bombings.

US Marshals stood guard outside Boston's Moakley Federal Courthouse after if was evacuated Wednesday afternoon.

Charles Krupa/AP

US Marshals stood guard outside Boston's Moakley Federal Courthouse after if was evacuated Wednesday afternoon.

Media and others descended upon the courthouse after initial reports suggested a suspect in the Boston Marathon bombings was arrested and would appear at the courthouse.

Jared Wickerham/Getty Images

Media and others descended upon the courthouse after initial reports suggested a suspect in the Boston Marathon bombings was arrested and would appear at the courthouse.

Employees were evacuated from the courthouse after a bomb threat was received.

CJ GUNTHER/EPA

Employees were evacuated from the courthouse after a bomb threat was received.

An officer patrolled outside the courthouse Wednesday afternoon.

Michael Dwyer/AP

An officer patrolled outside the courthouse Wednesday afternoon.

Investigators combed through the scene of one of the blast sites on Wednesday morning.

Julio Cortez/Associated Press

Investigators combed through the scene of one of the blast sites on Wednesday morning.

 A sign was taped to a barricade near the site of the bombings on Wednesday.

Bill Greene/Globe Staff

A sign was taped to a barricade near the site of the bombings on Wednesday.

Robert Bakoian of Boston prayed at the barricade to the crime scene at Boylston and Berkeley streets on Wednesday.

Bill Greene/Globe Staff

Robert Bakoian of Boston prayed at the barricade to the crime scene at Boylston and Berkeley streets on Wednesday.

Victoria Kichuk (left) of Brighton visited the makeshift memorial at Boylston and Berkeley streets.

Bill Greene/Globe Staff

Victoria Kichuk (left) of Brighton visited the makeshift memorial at Boylston and Berkeley streets.

Investigators worked at the scene on Boylston Street, and hundreds of officers fanned out across the city Tuesday.

John Tlumacki/Globe Staff

Investigators worked at the scene on Boylston Street, and hundreds of officers fanned out across the city Tuesday.

This image shows the remains of a pressure cooker that the FBI says was part of one of the bombs.

Reuters

This image shows the remains of a pressure cooker that the FBI says was part of one of the bombs.

Remains of what may have been part of the bomb.

Reuters

Remains of what may have been part of the bomb.

Remains of a backpack the FBI says contained one bomb.

ASSOCIATED PRESS

Remains of a backpack the FBI says contained one bomb.

Garvey Park in Dorchester was nearly filled with people during the vigil for Martin Richard, who was killed in Monday's blasts.

Yoon S. Byun/globe staff

Garvey Park in Dorchester was nearly filled with people during the vigil for Martin Richard, who was killed in Monday's blasts.

Members of the military walked along Boylston Street near the finish line of the Boston Marathon.

Aram Boghosian for The Boston Globe

Members of the military walked along Boylston Street near the finish line of the Boston Marathon.

Sox second baseman Dustin Pedroia walked past a sign from an Indians fan in the dugout.

Mark Duncan

Sox second baseman Dustin Pedroia walked past a sign from an Indians fan in the dugout.

Investigators were combing through the aftermath of the deadly Boston Marathon terrorist attack Tuesday.

John Tlumacki/Globe Staff

Investigators were combing through the aftermath of the deadly Boston Marathon terrorist attack Tuesday.

Suspect seen carrying, and perhaps dropping, black bag

Investigators are “very close” in the investigation, but officials issued statements firmly denying widespread media reports that a suspect was in custody.

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/04/17/BostonGlobe.com/Metro/Images/410481e440ce42d780aceba434a1f627-410481e440ce42d780aceba434a1f627-0-1852[1].jpg Victims of the Boston Marathon bombings

A list of those confirmed killed or injured in the Boston Marathon explosion.

Lingzi Lu, a Boston University graduate student, was killed in the Boston Marathon bombings Monday.

BU identifies third Marathon victim

Lingzi Lu, a Chinese graduate student at Boston University in mathematics and statistics, was the third victim of the marathon bombing.

President Obama and Democratic leaders failed to round up 60 votes in favor of enhanced background checks, a major initiative for Obama.

Senate gun vote

Measure for expanded background checks fails

The key element of the federal response to the elementary school massacre in Newtown, Conn. failed Wednesday afternoon.

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Opinion on the bombings

JOANNA WEISS

How do you tell a child about the Boston Marathon blasts?

This is school vacation week, and kids are expecting a week of heightened fun. How do you reconcile that with the terrible events of Monday?