A Tibetan exile who set himself alight two days ago in New Delhi died on Wednesday and police detained at least 100 other activists protesting against Chinese President Hu Jintao's arrival in the city.

The Indian capital is home to thousands of Tibetans who have vowed to use Hu's visit to focus global attention on the Chinese government's alleged repression in Tibet.

Protests escalated in India on Wednesday against the planned execution of a Sikh radical for his role in the assassination of a state chief minister by a suicide bomber in 1995.

Balwant Singh Rajoana was scheduled to be hanged Saturday morning at Patiala Jail in the northern Sikh-majority state of Punjab, in what would be the first execution carried out in India since 2004.

Indian Maoists killed 15 policemen on Tuesday in a landmine blast in the center of the country, local reports said, marking the deadliest attack by the left-wing rebels since June 2010.

The attack, which occurred in the east of Maharashtra state, is the latest incident in the low-intensity conflict that pits the insurgents against local and national authorities in the forests and rural areas of central and eastern India.

Maoist rebels in India on Sunday released one of two Italian men who were kidnapped 11 days ago in the eastern state of Orissa.

"It was a frightening experience. They have finally released me today. Let's hope they release Paolo (Bosusco) soon," Claudio Colangelo, 61, told the NDTV news channel after being freed.

India, which is rapidly expanding its atomic power program, said Saturday that nuclear terrorism is a "continuing concern" ahead of a summit on atomic safety to be held next week in Seoul.

The summit will focus on the threat from nuclear-armed terrorists and follows one in Washington convened by U.S. President Barack Obama in 2010 on the same subject.

Some 11.5 million foreigners are living in the United States without proper immigration documents, according to estimates released Friday by the U.S. Department of Homeland Security.

The figures, as of January 2011, show little difference from the 11.6 million figure published in 2010.

Interpol has issued "red notices" for four Iranians suspected of involvement in a bomb attack near the Israeli embassy in New Delhi, the international police agency said Thursday.

Indian authorities requested the notices, which instruct police across the globe to arrest the suspects, following the February 13 embassy attack that left an Israeli diplomat seriously injured.

An Indian court issued on Saturday an arrest warrant against another Iranian suspect in an attack last month on an Israeli diplomat in New Delhi, a report said.

Israel has accused Iran of masterminding the attack.

Indian police said Friday that Interpol "red corner" notices were being drawn up for three men of Iranian origin identified as suspects in an attack on an Israeli diplomat in New Delhi.

Delhi police commissioner Brijesh Kumar Gupta also revealed that investigations had established a clear link between the February 13 attack and a similar plot targeting Israeli diplomats in Bangkok.

Three Iranians have been named by Indian police as suspects in an attack on an Israeli diplomat in New Delhi, the first time Tehran has been firmly linked to the bombing, reports said Thursday.

The men entered the country on tourist visas and left after the bombing in the center of the Indian capital on February 13 that badly wounded a female worker at the Israeli embassy, The Times of India and The Indian Express reported.