(The Benjamites heard that the Israelites had gone up to Mizpah.) Then the Israelites said, "Tell us how this awful thing happened."
NIV
(Now the Benjamites [among whom the vile tragedy occurred] heard that the [other] Israelites had gone up to Mizpah.) There the Israelites asked, How did this wickedness happen?
AMP
(Now the children of Benjamin heard that the children of Israel were gone up to Mizpeh.) Then said the children of Israel, Tell us, how was this wickedness?
KJV