1.   On the north side of the Yamuna River in central India lies a rural floodplain of wheat and mustard fields, low forests and poor farming villages.

2.   Samples tested in government laboratories found it contained the seeds of a weed, Argemone mexicana, which often grows in mustard fields.

3.   So for now the refugees are stuck in eight isolated U.N.-run camps amid mustard fields and mango groves.

4.   That created a fuel shortage that eventually forced him to land in a mustard field in India.