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DETROIT – An undercover Michigan state trooper was injured early Tuesday after gunfire erupted at a Detroit apartment complex during a narcotics investigation, authorities said.

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Update 10:05 a.m. EDT Sept. 27: Michigan State Police said Tuesday that the condition of an officer critically injured in a shooting earlier in the day has been upgraded to stable condition.

“He still has a long way to go,” police said in a statement on social media. “If you have a moment, please say a prayer for him and his family.”

The trooper has not been identified.

Two people are in custody in connection with the shooting.

Update 9:50 a.m. EDT Sept. 27: Michigan State Police said two people were taken into custody Tuesday morning after an undercover state trooper was shot and injured during a narcotics investigation.

The two people were not immediately identified. Police said they also found casings in an apartment.

The trooper, who was not identified, was shot as a narcotics unit was doing surveillance early Tuesday morning. He remained in critical condition later Tuesday , officials said.

Original report: According to WDIV and WJBK, the incident occurred about 1:30 a.m. Tuesday at a Riverview Street apartment complex on the city’s northwest side. Michigan State Police tweeted that an “undercover narcotics unit was conducting surveillance” when an “unknown suspect” opened fire, striking a male trooper. The 10-year department veteran was rushed to Sinai Grace Hospital for treatment of multiple gunshot wounds, WJBK reported.

Shortly after 5:30 a.m. EDT, police tweeted that crews were trying to “make contact with any suspects located in the building from where the shots may have been fired” and advising residents to stay in their homes.

“Don’t come out. Don’t try to see what’s going on because we are just aren’t sure where he is,” state police Lt. Mike Shaw said, according to WJBK. “And since he’s already fired at us, it’s probably not likely that he’s not going to fire at somebody walking through that neighborhood.”

Police are still trying to obtain a warrant to search the apartments, the department wrote.

No further details, such as a suspect description or the wounded trooper’s name, were immediately available.