ISLAMABAD — India has alerted Pakistan about possible cross-border flooding after heavy monsoon rains in the South Asian region, Pakistan’s Foreign Ministry said on Monday, in what marks the first public official contact between the two nuclear-armed rivals in months.

The ministry said New Delhi conveyed the information through diplomatic channels instead of the Indus Waters Commission, the permanent mechanism created under the 1960 World Bank-brokered Indus Waters Treaty.

An Indian government official, speaking on condition of anonymity because he was not authorized to speak to the media, said the warning was shared on “humanitarian grounds” and not under the treaty.

There was no immediate comment from New Delhi.

The communication marked the first known diplomatic-level contact since

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