An unidentified man surrendered his wallet after four men, one possibly wielding a small knife, threatened him while walking home last week, authorities said.    
    
The victim was at the intersection of Four Mile Road and Notabene Drive when the group of men came up behind him about 6:30 p.m., February 14. After handing over his wallet, the suspects fled.
    
They are described as Hispanic between 5-foot-9 and 5-foot-11. One suspect appeared to be about 25 to 30 years old. The others were 42 to 45 years old, police said. 
    
The robbery remains under investigation.