One person, who is suspected to be associated with a terror outfit, has been detained and three of his associates are being questioned by a team of Delhi Police's Special Cell at Roorkee in Uttarakhand.
The detained suspect, identified as one Akhlaq, is likely to be brought to Delhi by tomorrow and produced before a court here.
The suspects are believed to have been planning an attack at the ongoing Ardh Kumbh Mela in Haridwar, a police source said today.
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The detained suspect is also being questioned in connection with the recent terror attack at Punjab's Pathankot as he is believed to have links with terror outfit Jaish-e-Mohammed, the source said.
Yesterday, the Special Cell of Delhi Police had arrested a person with suspected al Qaeda links from Nuh town in Haryana's Mewat district.
In a joint operation with a central intelligence agency, two persons were apprehended from there, of which one was arrested by the Special Cell, senior officials claimed.