The Chautauqua County Sheriff's Office is investigating an assault involving a female youth in the town of Clymer last month. Deputies say two females, 16 and 18 years of age, are accused of attacking a 17-year-old female from Jamestown during a large party on Wiltsie Road on June 14th. Deputies issued an appearance ticket for the 16-year-old and have filed for an arrest warrant for the 18-year-old.