ISTANBUL (Reuters) - The U.S. Embassy in Ankara said on Tuesday the State Department has authorised the voluntary departure of employees' family members in Turkey after a failed military coup.

Turkey's declaration of a state of emergency also prompted the State Department to change the status, the Embassy said in an e-mailed security message to Americans resident in Turkey.

"During this period, U.S. citizens in Turkey may see an increase in police or military activities and restrictions on movement," it said.

(Reporting by Ayla Jean Yackley; Editing by David Dolan)