The premier cut his London trip short to condole the loss of more than 150 in an oil tanker explosion.
Over last 24 hours
Rescue official says the death toll could rise further as dozens are still in critical condition.
Despite their severed ties, both Iran and Qatar on Saturday voiced support for Saudi Arabia after the attack.
Modi's visit to US takes place amid uncertainty over the relationship because of differences on trade and other issues.
Movers argue since Pakistan failed to effectively curb terrorism, it no longer deserves US economic, military assistance
Around 200 injured are still being treated as casualties in the attacks are feared to rise.