A man arrested on suspicion of rape may be a suspect in the rapes of several men in the Houston area over the past year, police said Wednesday.

The man, whose identity was not released, faces charges of kidnapping and sexual assault in a case from May, said Baytown police Capt. Roger Clifford. He said police were withholding the identity until other victims are able to see the suspect in a lineup.

Police for months have been investigating five cases in which young men were surprised at or near their homes by a gunman demanding money. The last reported attack was in November.

One of the victims pointed investigators to the man, Clifford said.

The suspect was arrested late Tuesday after DNA tests linked him to the victim in a May attack, Clifford said.

The investigation was complicated, in part because profilers don't have a basic standard for investigating male-on-male rapes, Clifford said.