Credit: Some 911 callers may have still received busy signals Monday as engineers worked to fix the problem.

After 2 deaths during 911 outage, Montgomery Co. exec seeks investigation

After Dallas shootings, Md. fire chief talks bomb robots

Montgomery Co. 911, non-emergency lines functional; busy signal may appear

Silver Alert issued for missing 85-year-old Md. man

Woman who kept 66 dogs in filthy conditions sentenced

Md. police chiefs, county executives respond in wake of Dallas shootings