Rare back-to-back bombings in the capitals of two nuclear-armed neighbors are threatening to send India and Pakistan to the brink of conflict for the second time this year, as tensions also soar between Pakistan and Afghanistan .

India is describing the car explosion that struck Delhi on Monday, killing at least eight people and injuring 20 others, as a “terror incident.” Authorities say they are investigating the explosion under an anti-terrorism law and considering “all possibilities.”

“The country has witnessed a heinous terror incident, perpetrated by anti-national forces,” Prime Minister Narendra Modi ’s cabinet said in a resolution on Wednesday.

The investigation must be “pursued with the utmost urgency and professionalism so that the perpetrators, their collaborators, a

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