Texas health officials said Wednesday that they have concluded their investigation into DaVita Inc.’s Lufkin Dialysis center following a recent spike in patient deaths, a state spokeswoman said. Results of the investigation have not been released.

The Lufkin Daily News reports that the dialysis center in east Texas, southeast of Dallas, was closed April 28 after contacting state health officials about a spike in patient deaths and life-threatening complications. No date has been given on when the center might reopen. The number of deaths has not been released and the investigative report will be released in a few weeks, according to the paper.

El Segundo-based DaVita, is the largest provider of dialysis service in the country, with more than 1,300 outpatient facilities in 43 states.

DaVita posted strong earnings at the end of April, with a 14 percent hike in quarterly profit and a 5 percent increase in sales.

Shares in DaVita were flat at $51.02 in early trading Friday.