Two children were electrocuted Wednesday evening  at a Fort Worth park by power lines knocked down in the powerful storms that blew through overnight. 

The Fort Worth Fire Department was called about 6:15 p.m. to Oakland Lake Park in the 1500 block of Oakland Lake Place, department spokesman Kyle Falkner said.

When fire units arrived, bystanders directed them to a heavily wooded area at the north end of the park where witnesses said the children had been electrocuted, he said. 

He said a third person who was with the boys was able to get out and call for help.

Fire crews made their way to where the boys were and confirmed that the power lines were still energized and arching, Falkner said. 

A grass fire had also been ignited from the lines. 

Oncor crews de-energized the lines so additional fire and medical units could safely go to the scene where the bodies were, and extinguish the fire, Falkner said. 

The children were pronounced dead at the scene about 8:15 p.m., Medstar spokesman Matt Zavadsky said.

The boys were 11 and 12 years old, authorities said. Their relationship to each other has not been released. 

The Tarrant County medical examiner's office will release their names and determine an official cause of death. 

Chaplains from the Fort Worth Police Department were on the scene to support the family of the victims, Falkner said. 

In a prepared statement, Oncor called the deaths a "tragic accident" and said it was working to determine the cause. 

"The safety of our customers and employees is the foundation for everything we do," the power company said. "Our thoughts and heartfelt prayers go out to the family."

Oncor and Fort Worth fire officials called for caution around power lines. 

Fire officials said strong winds from the storm early Wednesday were likely to blame for the downed lines. Other wind damage from the storms that rocked North Texas overnight could be seen in the area including felled limbs. 

The storm left more than 200,000 people without power Wednesday and forced many schools in the area to cancel classes.  

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