An 18-year-old man has been arrested in connection with an Aug. 4 sexual assault in the Overlook neighborhood and a robbery in the same area four days later, Portland police said early Wednesday.

Alex Francisco-Sebastian was booked into the Multnomah County Jail on accusations of first-degree rape, first-degree sodomy, strangulation, attempted first-degree kidnapping and second-degree robbery.

Francisco-Sebastian is accused of sexually assaulting a 54-year-old woman as she walked her dogs near the grounds of the Kaiser Permanente offices in the area of North Overlook Street and Kaiser Center Drive.

The attack took place about 10:30 p.m. The victim told police that she was approached by a man who spoke with her briefly and then pulled her into the bushes and sexually assaulted her.

The victim was able to walk home and call 9-1-1. She was treated and released at a Portland hospital.

Police were unable to find the suspect after searching the area that night.

Four days later, on the night of Aug. 8, a police officer was flagged down near the Failing Street pedestrian bridge over Interstate 5 by a person who had been robbed of an iPhone. The victim told police the suspect was last seen running eastbound across the bridge.

Though police didn't find anyone matching the suspect's description, they managed to track the stolen iPhone to the general area of a residence in the 4700 block of North Kerby Avenue. That led to the suspect, who on Tuesday met voluntarily with detectives. He was later arrested by detectives with the bureau's sex crimes unit.

Francisco-Sebastian is scheduled to be arraigned Wednesday in Multnomah County Circuit Court.

-- The Oregonian