Key Mumbai terror attack suspect and Indian Mujahideen terrorist Abu Hamza was on Monday arrested from the IGI Airport here.

Hamza alias Sayeed Zabi-ud-Deen alias Zabi Ansari alias Riyasat Ali was one of the Pakistani handlers who was giving instructions to the 26/11 terrorists, according to Delhi Police sources.

They said Hamza was in Pakistan when the 26/11 attack took place.

He was also wanted in connection with some cases in Gujarat, they said.

Hamza was produced before a court which remanded him to 15 day police custody.

After tracking him for more than three years, security agencies have arrested Sayed Zabiuddin alias Abu Hamza, alleged Lashker-e-Taiba ultra and the Hindi tutor of 10 terrorists who carried out the audacious attack in Mumbai in 2008.

30-year-old Zabiuddin alias Abu Jindal, who hails from Georai area of Beed district in Maharashtra, was arrested on June 21 when he arrived in India from a Gulf country, official sources said on Monday.

India had also secured an Interpol Red Corner notice against him in which he was accused of crimes involving the use of weapons, explosives and terrorism.

With his arrest, the mysterious voice recorded during the conversation between 10 Lashker terrorists and their handlers in Pakistan has been identified, the sources said.

According to the officials associated with the probe, Zabiuddin had told Lashker terrorists carrying out attack in Nariman House to convey to the media that the "attack was a trailer and the entire movie was yet to come".

The voice was that of Zabiuddin and after this his activities were traced before he was finally nabbed in a Gulf country, according to officials.

In the intercepted tapes, Zabiuddin was also heard using typical Hindi words like "prashasan" (government) and was directing the terrorists to conceal their Pakistani identity and identify themselves from Deccan Mujahideen hailing from Toli Chowk in Hyderabad.

His presence was also stated by Ajmal Kasab, the lone terrorist arrested during the Mumbai attack, in his deposition before a special court. He told the court that one person by the name of Abu Jindal had tutored 10 terrorists on how to speak Hindi.