Claiming a major breakthrough in last week's serial blasts in the national capital, Delhi police on Saturday said two of those arrested after Friday's encounter have confessed to their involvement in the terror act having planted explosives in two places.

Acting on a tip off, police on Friday night arrested a suspected militant Zeeshan from the premises of a news channel where he had gone to give an interview. With his arrest, police had caught two militants allegedly involved in the blasts.

Investigators are on the look out for at least ten people who planted bombs following the "disclosure" by Mohd Saif, who was arrested after a fierce encounter in South Delhi in which two other suspected militants were killed, a senior police official said.

The official claimed that Saif had confessed to his role in the Delhi serial blasts which claimed over 20 lives and that he planted a bomb near Regal Cinema in Connaught Place.

The bomb was defused after it was spotted by a rag picker who alerted police.

The official claimed that a group of two men each went to plant the bombs in the city.

Saif also told investigators that Atif, who was among the two who was killed in the daring encounter in Jamia Nagar on Friday, was the mastermind of the blasts and that he was a prominent member of the Indian Mujahideen, the official said.

Atif himself planted the bomb in Greater Kailash market in South Delhi, Saif is believed to have told sleuths of Delhi Police's Special Cell who are interrogating him.

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