Four Democratic senators have launched an investigation into an attack on U.S. troops in Kuwait that killed six service members and injured 20 others in early March.

Sens. Elizabeth Warren of Massachusetts, Richard Blumenthal of Connecticut, Kirsten Gillibrand of New York, and Mark Kelly of Arizona are leading the probe into the incident at a command post in Kuwait.

The attack occurred amid ongoing tensions between the United States and Iran. The specific circumstances and details of the March incident remain under scrutiny as part of the senators' investigation.

According to reports, surviving troops have disputed the Pentagon's account of the attack, with sources indicating the unit "was unprepared" to defend itself during the incident.

The investigation comes as lawmakers seek answers about the preparedness and security measures in place for U.S. forces stationed in the region. The senators' probe will examine the circumstances surrounding the attack and the military's response to the incident.