Delhi, April 27.—Pakistan troops crossed into India and exchanged fire with Indian security forces today in the most serious border incident between the two countries since their three-week war in 1965, official sources in Calcutta said.

The sources said the Pakistan soldiers raided an Indian village 65 miles north-east of Calcutta on the border with East Pakistan about 3.30 a.m. They killed five people including three women, injured Many others and set fire to several homes.

About five hours later, the sources added, the Pakistan Army came back to within 300 yards of the border and fired towards the Indian border checkpost at Haridaspur, which many East Pakistan refugees have used to enter India in the past month.

Indian officials said that the Indian para-military border security forces returned the firing by the Pakistanis during both incidents, forcing them to retreat.

Unconfirmed press reports reaching Calcutta said that 25 Indians were killed in an attack by Pakistanis on an Indian enclave on the East Pakistan border near Cooch Behar, about 275 miles north-east of Calcutta.

Officials in Calcutta said however that they did not have any Immediate confirmation of the reports.

The reports said the Pakistan troops, moving out from the Julaghat area near the Lalmonirhat police station, burned a number of houses at Bashpachai enclave. Several Indians hurt in the attack had bullet and burn injuries the reports added.

Indian news agencies also said that the Pakistan Army made an unprovoked attack on Indian outposts along the remote eastern border of East Pakistan next to Tripura state.

United News of India said the Pakistan Air Force fired rockets that landed only I00 yards short of the Indian border near Agartala, the capital of Tripura.

The incidents were reported as India and Pakistan held talks in Delhi to ease the diplomatic crisis on the subcontinent. In the past month, India and Pakistan have accused each other of several border violations.—A.P

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Our Delhi Correspondent writes India has protested to Pakistan against the virtual internment her Deputy High Commissioner and his staff in their houses in Dacca since the closure of the mission there yesterday.

An official statement here, expressing regret and concern, said "This is contrary to the assurances given to the Government of India earlier, and is also in violation of the Vienna Convention.”

The internment is probably in retaliation against Delhi's action in barring the departure of Pakistan diplomats in India without the Government's permission.

Mr. B. K. Acharya, the Indian High Commissioner in Islamabad, who arrived here last week, today met Mrs. Gandhi, the Prime Minister, and reviewed the worsening relations between the two countries.

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Delhi, April 27.—Foreign Ministry sources here said Mr. Acharya's return to Pakistan, planned for today, had been delayed, but he would certainly return to his post, probably in three or four days.

Meetings went on all day between Indian Foreign Ministry officials and Mr. Sajjad Hyder, the Pakistan High Commissioner.

In Calcutta, the West Bengal state government ordered "strict police vigilance " on about 30 West Pakistanis on the staff of the former Deputy High Commission there. An official spokesman said this was done on the advice of the central Government in view of the treatment of its diplomats in Dacca.—Reuter.