DETROIT (Reuters) — Auto parts supplier American Axle & Manufacturing Holdings Inc. on Tuesday said contract talks with the UAW aimed at settling a three-month-old strike had stalled since Sunday.

The Detroit supplier, which relies on General Motors for about 80 percent of its sales, said negotiations were snagged on two issues: health-care benefits and supplemental unemployment benefits.

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American Axle said the UAW had asked for a signing bonus of $5,000 for each of its workers under a new contract and had asked for one-time buyouts of up to $140,000 for American Axle workers who agree to leave the supplier’s payroll.