YouTube video upload / Lien Corey, an eyewitness, gives the Associated Press an accounting of what she saw in the immediate afermath of Saturday's explosion in New York City.
"We know it was a very serious incident, but we have a lot more work to do to be able to say what kind of motivation was behind this," New York Mayor Bill de Blasio told reporters. "Was it a political motivation? Was it a personal motivation? We do not know that yet."
A few blocks away from the blast site, investigators found one possible clue: a pressure cooker, with dark-colored wiring protruding, connected by silver duct tape to what appears to be a cellphone, officials told CNN and other media outlets on scene.
As reported by CNN: It's still unclear whether that suspicious device has any connection to Saturday's explosion, which shook New York City's Chelsea neighborhood and sent panicked people scrambling for cover. A police bomb squad was still investigating the device Sunday afternoon, NYPD Chief of Detectives Robert Boyce said.
"We don't have everything in -- think of a jigsaw puzzle out in the street right now," Boyce said. "Do we think they're related? Yes, we have to move in that direction, but right now we're not ready to make those calls yet."