MADRID, Spain -- Spanish police searched Friday for possible explosives at the Madrid headquarters of the ruling conservative Popular Party after a man rammed his car into the office entrance.

No one was injured in the early-morning incident and National Police spokesman Antonio Nevado told Spanish National Radio that the attack did not appear to be terrorism-related. The driver was arrested.

Nevado said bomb disposal experts searched the area in and around the Genova Street office in downtown Madrid. He said there were two gas cylinders in the car and police were also analyzing other material found in the vehicle.

"Everything indicates it was a personal action that has nothing to do with any type of terrorist action," Nevado said, saying the suspect had economic problems.

The central street was sealed off for four hours, creating traffic chaos.

Francisco Nacher, mayor of the eastern town of Bronchales, identified the detained man as resident Daniel Perez, 37. He told Cadena SER radio that Perez was unemployed but said he saw him daily and could not imagine what may have happened.

Demonstrators often protest near the ruling party's headquarters about corruption scandals or the government's handling of Spain's economic crisis.