The person who threw a large rock at Kevin McAleenan, the top U.S. border official, during a tour of Border Patrol’s San Diego Sector last week remains at-large five days after the incident, according to officials at the Homeland Security Department.

The department, as well as its U.S. Customs and Border Protection and U.S. Border Patrol components, have “no information on the individual on the south side” who threw the rock, a DHS official said Monday.