A suspect who police believe shot and killed a man and wounded a woman Saturday afternoon in Sunnyvale was arrested after being spotted in San Jose, authorities said.

Investigators are exploring the possibility that the violence was fueled by a road-rage encounter, according to a law-enforcement source.

After the arrest, police and residents around the San Jose-Campbell border had to hold their collective breath because of concerns that an explosive device might have been in the suspect’s vehicle, the source added. The ensuing bomb-squad response prompted a string of street closures and brought southbound traffic on Highway 17 to a standstill during the height of the scare.

The entire sequence began around 4:25 p.m. Saturday with a report of a shooting at Linnet Lane and Homestead Road, according to the Sunnyvale Department of Public Safety.

Responding officers went to the scene and found two victims inside a vehicle: A man dead from apparent gunshot injuries, and a woman suffering from at least one gunshot wound.

The woman was rushed to the hospital and is expected to survive, police said. Sunnyvale investigators identified a suspect, and sources said that San Jose police, working off that information, spotted the suspect at a liquor store in their city. Officers followed the suspect’s maroon SUV to the Shell gas station at Salmar and East Hamilton avenues.

The San Jose officers took the suspect into custody around 6:50 p.m., but soon after the SJPD bomb squad was summoned because of a suspicious device inside the suspect’s vehicle, a source said. Multiple law-enforcement agencies, including police from San Jose, Sunnyvale and Campbell, assembled in the area, and surrounding streets were closed off. The California Highway Patrol also blocked freeway drivers from exiting onto Hamilton Avenue.

At 9:41 p.m. Saturday, Sunnyvale DPS issued an alert announcing that “there is no ongoing threat to the community and no outstanding suspects.”

The alert also indicated that the suspect and victims did not know each other.

“Due to the ongoing investigation, the names of the suspect and victims will not be released at this time,” police said in the alert.

Additional details were not immediately released Saturday night. Sunnyvale police said they would issue an update on the investigation on Monday.

Anyone with information about the case can contact Sunnyvale Department of Public Safety Detective Ben Holt at 408-730-7143 or bholt@sunnyvale.ca.gov.