The Special Investigation Team (SIT) probing the attack on R. Krishna Kumar, a schoolteacher at Valakam on September 27, has intensified its search in the State capital for a white Alto car that knocked him down.

The decision to intensify the search for the car was taken as the SIT had gathered enough material to stick to its stand that the teacher was injured after being hit by a speeding vehicle. Sources told The Hindu that the SIT had commenced intensive search across the State following a door-to-door search in the border areas of Thiruvananthapuram and Kollam districts in which over 350 vehicles were checked.

The SIT had collected the registration particulars of all white Alto cars from the Motor Vehicles Department's database and had intensified the search to identify the car.

Sources said owners of the cars were being called from the control rooms to find the whereabouts of the car on September 27 and whether it passed through Main Central Road, specifically the Nilamel- Valakom- Kottarakara stretch.

In the capital, the city police personnel visited several houses to seek the travel details and use of the car. One of the registered owners having a white car said he was called by the local Sub Inspector. Many owners complained that they had to explain even the dents on the car if they had moved through the Valakam stretch. According to the sources, the only job left is to trace the car that knocked down Mr. Krishna Kumar as the SIT had obtained eyewitness to the incident on M.C. Road. The frequent change in statements by Mr. Krishna Kumar to the investigators about the incident is creating problems for the team.

The SIT had found no evidence to suggest that the teacher had sustained assault injuries. The conclusions were on the basis of expert opinion provided by a team of doctors attached to Thiruvananthapuram Medical College Hospital .