An army of law-enforcement personnel, with two police dogs on leashes, swarmed the North Attleborough, Mass. home of New England Patriots tight end Aaron Hernandez on Saturday afternoon and spent nearly four hours inside and around the grounds.

Investigators left at 5:30 p.m. with several brown bags, presumably filled with evidence. A spokeswoman for the Bristol District Attorney's office declined to comment on the investigation Saturday.

About a dozen officers arrived around 1:45 p.m., as neighbors gathered with the media across the street to watch the action. Hernandez and his lawyer were believed to be inside the home.

Police concentrated on a large doghouse or playhouse in the back yard and a wooded area near the home. They also searched Hernandez's white SUV, which was parked in the driveway.

Hernandez has been in the middle of a homicide investigation since a jogger found the body of Hernandez's friend, 27-year-old Odin Lloyd, a semipro football player, in an industrial park Monday, less a mile from Hernandez's home. Police said Lloyd had been shot in the head.

The Boston Globe reported that police have surveillance video that shows Hernandez and Lloyd together hours before he was believed to have been shot Monday morning.

There was widespread media speculation, and some erroneous reports, that an arrest warrant would be, or had been, issued for Hernandez on Friday, but a clerk in the Attleboro District Court told USA TODAY Sports no arrest warrant had been issued when the court offices shut for the weekend at 4:30 p.m.

The clerk said that although no warrant had been issued before the close of business, it doesn't mean Hernandez is in the clear for the weekend. The clerk said the North Attleborough Police Department could issue the paperwork between close of business and Monday morning.

Lloyd family members said Friday the two men were together the night before Lloyd died. They said Lloyd had been dating Hernandez's fiancee's sister for about two years.

Police have searched in and around Hernandez's sprawling home several times this week. Hernandez's attorney Michael Fee has acknowledged media reports about the state police search of Hernandez's home but said he wouldn't have any comment on it.