A worker died at SpaceX’s Starbase launch site in South Texas on Friday, and the Occupational Health and Safety Administration (OSHA) has opened an investigation.

The San Antonio Express-News reported Monday that the unidentified victim died at around 4:17 a.m. local time on May 15, citing OSHA and local officials. The Wall Street Journal later reported that the county sheriff confirmed to the outlet that a worker died. OSHA confirmed to TechCrunch that it is investigating the apparent accident.

Representatives for the nearby Brownsville police and fire departments did not respond to requests for comment. SpaceX and the newly-incorporated City of Starbase did not respond to requests for comment.

The circumstances of the worker’s death are not immediately clear. OSHA told TechCrunch that it won’t release more information until its investigation is complete, which could take months.

The death comes just a few days ahead of the first planned launch of SpaceX’s upgraded Starship rocket. Elon Musk’s spaceflight company is also reportedly releasing the detailed prospectus for its initial public offering this week, which is expected to be the biggest ever when that transaction takes place next month.