Tropical storm Harvey has moved deeper into Texas, bringing heavy rain to the southern US state's coastline and killing at least two people, according to Al Jazeera.

Throughout the region between Corpus Christi and Houston, many people fear that death toll is only the beginning.

Harvey came ashore as the fiercest hurricane to hit the US in 13 years and the strongest to strike Texas since 1961's Hurricane Carla, the most powerful Texas hurricane on record.

The Category 4 hurricane weakened to a tropical storm by Saturday afternoon and the National Hurricane Centre said it was likely to weaken to a tropical depression later on Sunday.