Boston's Police Commissioner says a 34-year-old homeless man with a violent history has been arrested in the stabbings of two city Park Rangers on Boston Common, the nation's oldest public park.

Commissioner William Evans said Bodio Hutchinson attacked the unarmed Rangers in what the Commissioner said was an unprovoked confrontation. Evans says witnesses followed the suspect, and provided cellphone video to Police.

He said a knife police believe was used in the attack was recovered from Frog Pond. Hutchison faces attempted murder charges.

One of the Rangers, 46-years old, underwent surgery at Mass. General Hospital. A second ranger, 23 years old, suffered less serious injuries and is hospitalized at Tufts Medical Center.

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