India, Nov. 12 -- Umar Un Nabi and Muzammil Ahmad Ganaie, two doctors who are now the focus of investigations into the rush hour blast near Red Fort that killed at least 10 people on Monday, visited sites near scene of the explosion in January this year, a senior police officer said.

Umar Un Nabi is suspected to have been been driving the car that exploded. Muzammil Ahmad Ganaie was arrested recently during raids by Haryana and Jammu and Kashmir police in Faridabad as part of a crackdown on an alleged "white collar" terror network.

The officer said that the two had known each other for many years and were working together at the Al- Falah University in Faridabad. Umar was working there as an assistant professor. The two hail from the sa...