Outraged at the inhumane treatment of workers in China who make iPads, iPhones and other Apple products, protesters visited a half-dozen Apple stores around the world to deliver petitions calling for reforms in the working conditions at factories run by Apple’s suppliers, AFL-CIO reports.

A demonstration at Apple’s Grand Central Terminal store in New York City drew a dozen people, who peacefully handed over a petition with 250,000 signatures to an Apple store manager.

The protests come on the heels of recent revelations of harsh conditions and onerous work environments at Apple’s controversial Chinese supplier Foxconn, where more than a dozen employees have committed suicide.

In a statement, Apple said it insists that suppliers “provide safe working conditions, treat workers with dignity and respect, and use environmentally responsible manufacturing processes wherever Apple products are made. Our suppliers must live up to these requirements if they want to keep doing business with Apple.”