CAMDEN, N.J. (CBSNewYork) — A $20,000 reward is now being offered for information leading to an arrest and conviction in connection with the shooting of two undercover police officers in Camden, New Jersey.

Authorities said two gunmen opened fire on the officers who were sitting in their vehicle at a red light Tuesday night, leaving both officers wounded and spurring an intense manhunt for the suspects.

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One of the two detectives was able to return fire, but it’s not clear if either gunman was shot in the exchange. County authorities remained in communication with hospitals in the region in case either suspect sought treatment for injuries they may have suffered.

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The detectives, a man and a woman whose names were not released, both were wounded and taken to a hospital for treatment. Each was listed in stable condition on Wednesday and both are expected to survive.

“The information we have thus far is that they were essentially ambushed,” Camden County Police Chief J. Scott Thomson told reporters at a news conference late Tuesday night.

Police continue to search for the suspects involved in the “unprovoked” attack, authorities said.

The two detectives have both been placed on paid administrative leave while the investigation continues. This is standard procedure following police-involved shootings.

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(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)