AUGUSTA, Maine (AP) — The Maine Senate has rejected a bill calling for cell phone safety notifications, leaving its prospects for passage in doubt.

Senators voted 20-13 on Thursday to reject the bill, which comes up a year after Maine lawmakers rejected a different bill requiring warnings about cellular phone use, and days after the International Agency for Research on Cancer said cell phones are possible cancer-causing agents.

The bill rejected by the Senate would require cell phones and their packaging have warning labels relating to potential health effects.

An amended version approved by the House directs cellular telephone manufacturers to place safety notifications already in the cell phone manual also on the box of the cell phone.