Washington deeply alarmed by the frequency of such attacks in recent months.
At least 310 people were killed and hundreds more injured in a series of apparently coordinated attacks across Sri Lanka on Easter Sunday.
Pakistan is due to vote on Wednesday in general elections overshadowed by deadly terrorist attacks.
A wave of terrorist attacks has rocked the South Asian country this week after a period of relative calm.
The Somali militant group Al Shabaab has killed dozens in the region in recent months.
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