FBI agents in Puerto Rico have arrested 20 teachers charged in a nearly $1 million fraud case involving federal funds for special education.

FBI spokesman Carlos Osorio told The Associated Press that the teachers face charges including theft of government money and property and aggravated identity theft.

The teachers work for a U.S. company called Rocket Learning LLC that provides tutoring services at public schools in Puerto Rico. Federal authorities last year charged 31 directors and program managers from that company in the same case.

Those arrested earlier are charged with submitting fake invoices to obtain more than $954,000 of that amount for themselves.