WASHINGTON: A driver unfamiliar with Washington, DC, appeared to have been lost and confused when he followed a motorcade carrying President Barack Obama‘s daughters through a White House checkpoint on Tuesday, a law enforcement source said.

“It appears at this point that the driver was confused, not familiar with DC, and essentially got lost and followed the car in front of him,” said the law enforcement source, who spoke on condition of anonymity because the investigation was continuing.

The unusual incident prompted a security lockdown at the White House. The driver, an Internal Revenue Service employee identified as Mathew Evan Goldstein, 55, was charged with unlawful entry, a misdemeanor offense.