UPPER MARLBORO, Md. (WUSA) -- Responding to questions asked by his attorney, Officer James Harrison said he was initially concerned by John McKenna's "bizarre" behavior as the University of Maryland student walked down the street waving his arms during the raucous celebration of Maryland's victory over Duke on March 3, 2010.

Officer Harrison said he began hitting McKenna with his baton after seeing McKenna punch Officer Reginald Baker in the head with a clenched fist; a fist containing what Officer Harrison claims he thought could have been a weapon, but which he later learned was a cell phone.

Officer Harrison said he continued hitting McKenna because McKenna refused to drop what was in his hand despite being ordered to do so.

But under cross-examination, Harrison could not fully explain why he made little attempt to see what was actually in McKenna's hand after he and Officer Baker stopped hitting McKenna.

Also under cross-examination, Officer Harrison admitted lying about his involvement in the incident, telling the police department's internal affairs section when first questioned that he was not one of the officers who hit John Mckenna.

Closing arguments in the case are expected on Friday.

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