Washington (Agencies): As the US vowed to cooperate with India to resolve the matter of affected Indian students of a sham US university, three more students have been freed of radio monitor tags by authorities.

With the three new removals on Wednesday, the US Immigration and Custom Enforcement (ICE) has freed five of the 18 Indian students from monitor anklets.

ICE has also returned the passports of the five students who were taken to ICE by two immigration attorneys, Kalpana Peddibhotla and Manpreet Gahra, Indian officials informed.

Encouraged by the affirmative development, 10 more students would be taken to ICE next week by these two immigration attorneys and they are very optimistic of the same positive outcome, they said.

The two immigration attorneys from the South Asian Bar Association had held free legal assistance camp for the TVU students in association with the Indian consulate in San Francisco.

Meanwhile, in Washington an official said the US would work cooperatively with India to resolve the matter, but said it's hard to say what is possible pending a full probe.

The issue "remains under investigation", State Department spokesman PJ Crowley had said when asked about the status of the affected students.

"The US would continue to welcome Indian students to study here," he said, urging them to "avail themselves of all the available information on how to do this, and alert them to the potential for fraudulent institutions that are trying to do these kinds of things".

Noting that it was "a matter of great concern" to both the countries, Crowley promised "to keep Indian authorities fully informed, but we have to go through this investigation first".

US investigates TVU visa row

Acknowledging that the closure of the California-based Tri Valley University is causing great trouble to a large number of Indian students, US on Thursday said there was a strong sign that "visa fraud has occurred" and the matter has to be investigated.

"We have strong suspicions that visa fraud has occurred. It is a matter of great concern to us as a country. It's a matter of great concern to India as a country. We will seek to resolve this as quickly as we can. We will pledge to keep Indian authorities fully informed. But we have to go through this investigation first," State Department spokesman PJ Crowley said.

"We do understand that, and we've pledged our cooperation. But we do, you know, recognise that there are strong indications of visa fraud. We don't know who's involved. We don't know how they got involved, but this has to be investigated fully. And we will do that," he added.

"The (US) embassy in Delhi has also issued some statements that reiterate that the embassy is available as a resource to help students who want to apply to come to schools in the United States," Crowley noted.