An FBI team investigating the attack on the U.S. Consulate in Libya traveled to Benghazi for the first time late Wednesday to examine the site where Ambassador Chris Stevens and three other Americans were killed last month.

A small military team provided logistical and security support to the FBI agents investigating in Benghazi, Pentagon spokesman George Little said Thursday. The team left Benghazi Thursday after staying for less than a day, he said.

The FBI team had been delayed from entering Benghazi due to security concerns, as lawmakers raised questions about the thoroughness of the investigation.

Little said a “small footprint of U.S. military personnel” provided airlift support for the FBI team, which remained in Benghazi for a number of hours before departing Thursday. He declined to discuss additional details of the mission.