Brent futures increased by $2.63, or 3%, to $89.74 a barrel, while the most active US WTI contract climbed 3.1%, or $2.56, to $84.66 per barrel.

The cause of explosions at an airport in Isafahan, Iran, was not immediately clear, but several flights were diverted over Iranian airspace.

A US official told ABC News that Israeli missiles had hit the site.

A note from Warren Patterson, ING's head of commodities strategy, expresses concerns over potential escalation between Israel and Iran following reports of Israeli responses to last weekend's Iranian drone and missile attack.

The attack came after a suspected Israeli strike on Iran's embassy compound in Syria.

Although most of the drones and missiles were intercepted, the incident has raised fears of supply disruptions in the oil industry due to increased tensions.

Investors are closely watching Israel's reaction to the April 13 attacks.

The geopolitical risk premium in oil prices was decreasing this week due to the belief that any Israeli response to Iran's attack would be tempered by international pressure.

However, two major developments in the oil market caused some uncertainty.

First, Venezuela lost a US license to export oil globally, which could reduce the overall supply.

Second, the US imposed sanctions on Iran's unmanned aerial vehicle program but not its oil industry, which could keep Iranian oil in the market.