Several hundred vehicles that traveled from Tokyo to Nagoya on expressways Aug. 24 are being looked at as part of investigations into the abduction of a 19-year-old woman, informed sources said Thursday.

Chiba and Aichi prefectural police have identified about 3,000 vehicles that traveled from Tokyo to Nagoya on the Chuo and Tomei expressways between roughly 9 a.m. and 8:30 p.m. that day.

They will only look into vehicles whose ownership is unclear, the sources said.

Investigators have not determined what type of vehicle was used in the abduction, although the young woman, the sister of a young man killed in the 1994 sarin gas attack in Matsumoto, Nagano Prefecture, told police that the vehicle "seemed to be a regular passenger car," the sources said. She told police that she was blindfolded while being detained by her abductors.

The woman was abducted near her family's home in Narashino around 9 a.m. Tuesday and freed in Nagoya, about 400 km away, 12 hours later.