On Thursday, Dallas Police recovered multiple submerged vehicles from Lake Cliff Park.

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The department’s underwater recovery team found and recovered four vehicles as of 5 p.m. Thursday, according to a news release from Dallas police. Police said the operation is expected to last multiple days, and that the recovered vehicles are believed to be connected to ongoing operations.

Sources told WFAA that the vehicles were found as part of routine cleaning, which hasn’t been done at Lake Cliff in about 10 years.

Recovery efforts will continue Friday, and police did not say what kind of ongoing investigations the vehicles may be tied to.