MUMBAI - Indian security agencies arrested three people in Kishtwar of northwest Jammu and Kashmir on Thursday morning by tracing the origin of an email claiming responsibility for a blast at high court in New Delhi one day earlier.

Included are Khawja Mehmood Aziz, an Internet caf owner, and his brother Khalid Aziz, said local media report.

Multi media organizations received an email Wednesday shortly after the deadly blast, alleging from terrorist group Harkat-ul-Jihad al-Islami (HuJI).

The email demands immediate repealing of death sentence with Mohammed Afzal Guru and threats to attack major high courts and the Supreme Court of India.

An investigation team is quizzing the suspects and examining relevant records of mails and other details.

The death toll of high court has risen to 12 now with more than 70 people injured.