A massive explosion has occurred at a Philadelphia refinery, sending gas prices even higher.

According CBS News, a vat of butane caught on fire early this morning and eventually exploded. This set off a series of other explosions as the fire spread across the facility.

The initial explosion occurred around 4 a.m. EST time, but fire fighters were able to contain the blaze by 7 a.m. While the fire hasn’t been fully extinguished, initial reports suggest between one and four people suffered minor injuries.

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That’s pretty lucky considering CNN reported Philadelphia deputy fire commissioner Craig Murphy said employees were “working somewhere close to the vat.” Thankfully for them, they were far enough away from the initial explosion to escape significant harm.

The extent of the damage remains unclear, but the company’s website says the facility processes approximately 335,000 barrels of crude oil every day.  This makes it the largest oil refining complex on the East Coast.

Unsurprisingly, any damage could have an impact on gas prices as we head into traditionally busy 4th of July weekend. CNBC reports gasoline futures climbed 3.5% this morning, while Wells Fargo suggested gas prices on the East Coast could rise between three and five cents a gallon due to the refinery fire.

The fire comes at a partially bad time as tensions in the Middle East have been high following a series of attacks on ships in the Gulf of Oman. The United States has blamed this on Iran, something the country strongly denies.

The situation become even more serious after Iran shot down an American drone earlier this week. The United States says the drone was operating in international airspace, while Iran claims it crossed their boarder.

Several news groups reported President Trump ordered a military strike in retaliation and he seemed to confirm that in a tweet earlier today. According to Trump, “We were cocked & loaded to retaliate last night on 3 different sights when I asked, how many will die. 150 people, sir, was the answer from a General. 10 minutes before the strike I stopped it, not proportionate to shooting down an unmanned drone.”