Minicamp in Waltham

Omar Cook shoots during minicamp (AP)

The Celtics held the first day of a four-day minicamp in Waltham this morning. The camp, which features 16-20 players, mostly rookies and free agents, runs through Saturday.

Check out our photo gallery from today's action.

Among the attendees: Second-year players Glen "Big Baby" Davis and Gabe Pruitt. Stroll through our gallery to see who else is in town for the event.

The Globe's Marc J. Spears touched on the minicamp in his Sunday notes column:

The Celtics will hold a minicamp for 16-20 players at their Waltham training facility from Wednesday through Saturday. Celtics forward Glen Davis, guard Gabe Pruitt, and first-round draft pick J.R. Giddens are expected to participate, as are ex-NBA players center Jackie Butler, forward Lawrence Roberts, and guards David Noel, Omar Cook, and Mustapha Shakur. Forward Bill Walker, a second-round selection by Washington who was traded to Boston, will not participate. Ainge said Walker will likely undergo minor knee surgery this week.