U.S. and Western military officials are calling on Iran to help stabilize Afghanistan, but historic tensions and allegations of arming militants raise doubts about Tehran’s intent.

The arrests of four Iranian-Americans have created a chill among those in Iran working to open up civil society and led to disagreements over U.S. support for those efforts.

Two years after a tsunami devastated several Indian Ocean countries, a rudimentary warning system is in place. But coordination and funding concerns have slowed plans for a permanent regional system.