Members of the Liverpool band Her's were killed alongside their manager in a 'head-on collision' caused by a 63-year-old driver travelling in the wrong direction.
Police said an alcoholic beverage container was found near the crash scene, although it is not clear at this stage which vehicle it came from.
Her's band members Stephen Fitzpatrick, 24, and Audun Laading, 25, were killed alongside their tour manager Trevor Engelbrektson when their Ford passenger van crashed into a pickup.
Police reported there were no signs of the vehicles braking before the collision.
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A spokesman for the Arizona Department of Public Safety said a report was received just after 1am on March 27 that a vehicle was travelling the wrong way on the westbound carriageway of the I-10 freeway.
A short time after the initial report there was a 'head-on collision' and both vehicles burst into flames almost immediately.
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The Arizona Department of Public Safety has also reported that "an alcoholic beverage container was located in the debris field", though it hasn't been confirmed as to which vehicle the container had come from.
Her’s was an up-and-coming band from Liverpool and had performed in Phoenix as part of their US tour.
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They were on their way to Santa Ana for another show when the crash occurred.
Stephen and Audun met at Liverpool Institute for Performing Arts after coming from Barrow in Furness and Norway respectively.
They had been on a 19-date tour of the States in support of their debut album, Invitation to Her's, which featured singles Love on the line and She Needs Him.
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