PHOENIX — From the announcement of a new Costco coming to north Phoenix to an arrest in the murder of two teenagers found dead in a campsite earlier this year, here are some of the top Arizona news stories from Oct. 3-5.

Costco, 2 hotels confirmed occupants for mixed-use development near TSMC

The mixed-use development surrounding TSMC in north Phoenix is starting to take shape with new agreements in place for a Costco store and new hotels.

Mack Halo Vista LLC announced Courtyard Marriott and Residence Inn will join Costco and an additional auto mall at Halo Vista, a 2,300-acre, mixed-used development located near the junction at Interstate 17 and Dove Valley Road.

Arizona gas prices could spike by up to 95 cents after California refinery fire, expert says

A massive fire at a Southern

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