WASHINGTON DC, United States?Graco Children's Products Inc. announced Wednesday a voluntarily recall of two million strollers after four fatal cases of infant strangulation, said the US Consumer Product Safety Commission (CPSC).

"Consumers should stop using recalled products immediately unless otherwise instructed," the CPSC said in a statement, adding that it was "illegal" to sell or resell a recalled product.

CPSC and Graco received four reports of infant deaths involving "older versions of the Graco Quattro Tour and MetroLite strollers and travel systems" between 2003 and 2005, said the commission.

An unharnessed child "can pass through the opening between the stroller tray and seat bottom, but his/her head and neck can become entrapped by the tray. Infants who become entrapped at the neck area are at risk of strangulation,? it added.