FDA Investigating Del. Heparin Deaths

"We're looking at everything on our end," she said.

Rick Chambers, a spokesman for New York-based Pfizer, said the heparin provided to Baxter was manufactured at a Pfizer plant outside Dayton, Ohio, and that the company has provided samples from the same lot to the FDA for testing.

"We are cooperating fully with Baxter and the FDA on their investigation," he said.