There may be more worries for the state of Texas in the United States with reports that an explosion was heard in downtown Houston on Monday.

Eyewitness video showed a raging fire shooting from the windows of the Lone Star Legal Aid Offices in downtown Houston, the United States.

A thick cloud of smoke could also be seen rising in downtown at the site of the fire but the cause of the incident was not immediately clear.

Also Read: Several Stranded As Hurricane Harvey Hits Texas

Meanwhile, rainfall continued in great Houston area.

The National Weather Service said new rainfall in Houston would amount to 5 and 8 cm with showers and thunderstorms throughout the day.

Houston mayor, Sylvester Turner, said in a news conference said that so far, around 5,000 people had been rescued to shelters in Houston.   

The U.S. Department of Defence is also pre-positioning troops, search and rescue units, aircraft, vehicles, equipment and supplies to staging areas near the worst of the flooding in southeastern Texas in anticipation of a possible request for assistance.

Pentagon spokesman, Col. Robert Manning, gave the response efforts to Hurricane Harvey and its aftermath, and summarised activities of the Texas National Guard and the National Guard Bureau.

“Continuing rainfall from the hurricane is expected to cause devastating and life-threatening flooding throughout this week,” Manning said, adding, “Our thoughts and prayers are with the victims.”