Boston, MA (Sports Network) - Officials from the city of Boston and state of Massachusetts, joined by federal authorities, held a news conference Tuesday to update the situation involved with Monday's bombings at the Boston Marathon.
Massachusetts governor Deval Patrick said the only two explosives found at the scene were those that went off. There were no additional explosives he said, although there had been reports Monday that unexploded devices were found.
Three people were killed after a pair of explosions near the finish line of the Boston Marathon at 2:50 p.m. ET. Patrick said Tuesday the number of injured is about 150.
In a separate news conference Tuesday at the White House, President Barack Obama said the FBI is investigating the bombings as an "act of terrorism."
"This was a heinous and cowardly act," said President Obama on Tuesday. "Any time a bomb is used to target innocent civilians, it is an act of terror. What we don't yet know, however, is who carried it out, and why.
"It will take time to determine what happened, but we will find out. We will find whoever harmed our citizens, and we will bring them to justice."
Police commissioner Ed Davis and FBI special agent Rick DesLauriers, at the Boston press briefing, asked for the public's continued help in the investigation.
Davis said the crime scene had been reduced from 15 blocks, centered around the marathon's finish line on Boylston Street, to about 12 blocks and would continue to dwindle as the investigation goes along.
DesLauriers said the FBI has received "voluminous tips" and were following up on numerous leads.
"The American public wants answers," said DeLauriers. "This remains a very active investigation. However, there are no known additional threats."
Boston mayor Thomas Menino thanked the first responders and all citizens who helped in the aftermath, adding that the city would overcome the devastation.
"This is a tragedy, but Boston's a strong city and we'll get through it," said Menino. "Boston will overcome."
The Boston sports schedule for the week had included an NBA game between the Celtics and Pacers on Tuesday. That game was canceled Monday with no plans to make it up, as both teams have already solidified their spots in the upcoming playoffs.
The Red Sox had just wrapped up their annual Patriots' Day game at Fenway Park, about a 1.5 miles from the crime scene. They will play in Cleveland this week before returning home Friday to start a weekend series with Kansas City.
The Bruins had a Monday game against Ottawa postponed and are set to play at home again on Wednesday against Buffalo.