LAS VEGAS — Las Vegas police confirmed Tuesday that they served a search warrant this week in connection with the long-unsolved killing of Tupac Shakur, propelling the case back into the spotlight nearly 30 years after his death.

Shakur, one of the most prolific figures in hip-hop, was gunned down the night of Sept. 7, 1996, in a drive-by shooting in Las Vegas. He was 25.

No arrests have ever been made. Yet attention on the case, which has seen its share of conspiracy theories, has endured for decades.

The Las Vegas Metropolitan Police Department said in a statement that the search was conducted Monday in the nearby city of Henderson, but the agency did not say whether a suspect has been identified. It’s also unclear what they were looking for and where they were looking.

Citing the ongoing investigation, a department spokesperson said he couldn’t provide more details on the latest development in the case.

Nevada does not have a time limit for prosecuting homicide cases.

Shakur was shot while sitting inside a black BMW with Marion “Suge” Knight, head of Death Row Records. Police have said the two were waiting at a red light near the Las Vegas Strip when a white Cadillac pulled up next to them and gunfire erupted. Shot multiple times, Shakur was rushed to a hospital, where he died six days later.

Las Vegas police have said in the past that the investigation quickly stalled in part because witnesses refused to cooperate.