Bulldozers operate on a road under construction near Doha Towers June 25, 2013.

:: Three workers died and several were injured at a building site in Qatar, which has come under pressure to improve conditions for laborers working on venues for the 2022 World Cup, state news agency QNA reported.

Citing the Gulf Arab state’s defense ministry, QNA said late on Tuesday that the deaths occurred during an “incident” at a construction site belonging to the Qatari armed forces but gave no details. The ministry “stressed its commitment to abide by the highest safety standards in all its facilities,” QNA said.

Qatar, which has long been under fire from rights groups for labor abuses and is under pressure from the United Nations to make changes, has said it is working to improve conditions.

The kingdom denies abusing workers and says it is implementing labor reforms.