Police in Tokyo's Sumida Ward are investigating a series of incidents in which rocks and a glass bottle were thrown at emergency service vehicles in the area.
Police have revealed that over 13 cases of rocks being thrown at ambulances have been logged since November of last year, TBS reported.
Some were carrying patients and moving at high speeds along Japan National Route 2, it was reported. On June 2 at around 9:30 p.m. a glass bottle was thrown at an ambulance traveling at a high speed along the same national highway.
So far, the projectiles have not caused any crashes, but police say they are expediting the search for those responsible in an attempt to prevent a serious incident, TBS reported.© Japan Today