Mexican authorities said Friday that federal forces had found what appeared to be the body of one of 10 employees of a Canadian mining company who were kidnapped three weeks ago from a city in the Mexican state of Sinaloa.

The attorney general’s office issued a statement Friday evening saying that “bodies and human remains” were found during the ongoing search for the abducted employees of Vizsla Silver Corp.

The statement said that one of the bodies “shares characteristics similar to one of the individuals reported missing” and that work was underway to confirm the identity. It did not say how many other bodies had been found.

According to the statement, so far, four people have been arrested in connection with the kidnapping.