Special police forces stand guard outside the Council Chamber of Brussels on March 24, 2016 during investigations into the Paris and Brussels terror attacks. More than 30 people have been identified as being involved in a network behind the Paris attacks on November 13, with links now established to this week's bombings in Brussels. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD        (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
Sources: ISIS terrorists planned to attack soccer championships
03:06 - Source: CNN
CNN  — 

The U.S. Embassy in South Africa issued a statement Saturday warning U.S. citizens about the threat of “near-term attacks against places where U.S. citizens congregate in South Africa, such as upscale shopping areas and malls in Johannesburg and Cape Town.”

The embassy said the warning was issued after ISIS called on its militants to “carry out terrorist attacks globally during the upcoming month of Ramadan.”

The U.S. State Department updated a worldwide caution in March, saying ISIS and other terrorist groups continue to plan attacks in many areas of the world. The caution did not specifically mention South Africa.

In Germany Thursday, three Syrian men were arrested on suspicion of planning an attack that was ordered by ISIS. The German attorney general’s office said the men wanted to attack the old town in Dusseldorf in western Germany with suicide bombings, guns and explosives.

Attacks claimed by ISIS left 32 people dead in Brussels on March 22, and 130 people were killed in Paris on November 13 in a series of attacks by several ISIS operatives.

CNN’s Melissa Gray and Milena Veselinovic contributed to this report