Puerto Rico's economic crisis may be keeping some public school students at home.

Unpaid school bus drivers are on strike, leaving some 15,000 students without their usual transportation.

Union leader Jose Rosado said Thursday that drivers haven't been paid since August. The government of the U.S. territory says it's running out of money as it seeks to restructure nearly $70 billion in public debt.

Education officials say the island's Treasury Department is releasing $2.8 million this week to pay the drivers. They also say another $4 million to $5 million will be released in upcoming weeks for the same purpose.

Thursday's strike affects three cities, including the capital of San Juan.