PHOENIX (AZFamily) — A law enforcement situation is causing a major traffic backup on a busy Phoenix freeway early Wednesday.

According to the Arizona Department of Transportation (ADOT), an active police situation was blocking all lanes on I-10 westbound at the “Stack.” The “Stack” is a four-level interchange connecting I-10 and I-17 west of downtown Phoenix.

All lanes have since reopened, but drivers should expect heavy traffic delays near the downtown area.

Arizona’s Family has reached out to the Department of Public Safety (DPS) for more information on what led up to the situation.

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