7 arrested in Sears Tower plot

MIAMI, Florida (CNN) -- Seven people are in custody after a sweep by law enforcement authorities in connection with an alleged plot against targets that may have included the Sears Tower, officials told CNN on Thursday. Officials said no weapons or bomb-making materials had been found in the searches in the Miami area by FBI and state and local law enforcement officials. The city is under no imminent threat, according to the FBI. Law enforcement sources told CNN that the arrests disrupted what may have been the early stages of a domestic terrorist plot to attack the Sears Tower in Chicago, Illinois, the FBI building in Miami, and possibly other targets. The 110-story Sears Tower is the world's third-tallest building and the tallest in North America. Sources told CNN that the arrests culminated a yearlong, undercover operation. Documents related to the investigation have been sealed. One of the arrests was made before Thursday, officials said. The FBI said one search warrant was executed in a warehouse near a housing project in Liberty City, a predominantly black and low-income area of Miami. Cedric Thomas, a co-owner of Thomas Produce Market, told the Miami Herald that the area around his store was teeming with federal agents. ''There is a ton of guys in uniforms moving around, blocking the streets. I'm not sure what they are doing,'' Thomas told the newspaper. "We are conducting a number of arrests and searches, and we'll have more about that when the operation is completed, probably tomorrow morning," FBI Director Robert Mueller told CNN's Larry King in an interview broadcast Thursday night. "Because it's an ongoing operation, we really can't get into details," Mueller said. "But whenever we undertake an operation like this, we would not do it without the approval of a judge. We've got search warrants and arrest warrants and the like. ...." In a statement, the U.S. attorney's office in Miami said federal, state and local agencies made the arrests in connection with a domestic "terrorist-related matter." Attorney General Alberto Gonzales will hold a news conference Friday regarding the raids. CNN's Kevin Bohn and Susan Candiotti contributed to this report. Copyright 2006 CNN. All rights reserved.>