Cyclone Ockhi intensified into a severe cyclonic storm and moved towards Lakshadweep today after causing heavy rain that has left at least 13 people dead in Tamil Nadu and Kerala. The Navy has been called in to rescue stranded fishermen. Cyclone Ockhi is likely to strengthen further, triggering a "red warning" for Lakshadweep - the highest category alert. The worst seems to be over in the mainland but forecasters have warned of heavy rain in parts of Kerala and Tamil Nadu. Schools near the coast in the two states have been closed.