One teenage boy was killed and another was injured when they were attacked by a 115-pound bull mastiff dog in northern New Jersey. Authorities say it's not clear what sparked the attack.

The Record reports the 13-year-old boys were walking in Paterson when they were attacked Friday. They ran off in different directions, and one boy was later reported missing.

A search was conducted, and the missing youth was found dead around 11 p.m. Friday. A cause of death hasn't been determined.

The other teen and the dog's owner were both treated for bite wounds.

The newspaper said the dog's owner stabbed the animal "quite a few times" during the attack. The dog was euthanized, and authorities say its remains will be tested for rabies.

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