TUCSON, Ariz. -- An Army sergeant based at Fort Huachuca has been arrested on a child molestation charge after his girlfriend told officers she'd seen images of him sexually abusing a 4-year-old girl on his computer, authorities said.

Sgt. 1st Class Robert D. Higgins, 33, of Sierra Vista was also arrested on suspicion of sexual exploitation of a child and tampering with or destroying evidence, said Mertie Stompro, a Sierra Vista Police Department detective.

Higgins' girlfriend called 911 early Sunday saying she had seen the images, Stompro said, and officers went to his home and found evidence. Higgins had left, but was found Monday morning at a Sierra Vista hotel and arrested.

Higgins is being held on $200,000 bond at the Cochise County Jail.