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Islamabad has warned of retaliation in case of military action from India's side.

The suspension is among several steps India has taken against Pakistan, accusing it of backing cross-border terrorism - a charge Islamabad flatly denies.

Islamabad suspended all visas issued to Indian nationals under an exemption scheme with immediate effect, as well as expelling some of its neighbour's diplomats and closing its airspace to Indian flights.

India has also cancelled some visas held by Pakistanis and ordered holders to leave within two days, while demanding Pakistan renounces "support for cross-border terrorism" - something Islamabad denies.

At least 11 incidents have been confirmed in major cities such as Lahore, Karachi and Islamabad.