FAYETTEVILLE, N.C. (AP) -- North Carolina police are investigating why it took more than an hour to dispatch officers to the home of a real estate developer who killed his wife and two teenage children and himself last week.

Multiple media outlets report that Fayetteville police are reviewing a 911 call placed from a landline phone in the home of 47-year-old William Maxwell while he was killing his family.

In the call a female can be heard moaning, followed by a gunshot before the line goes dead. Officers were sent to the home just before Maxwell's father-in-law called from the home to report a murder-suicide more than an hour after the first 911 call.

The 911 dispatcher had called the phone back after the line went dead but got a busy signal and later left a message on the answering machine.

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