An offshoot terror cell affiliated with Islamic State has published propaganda encouraging jihadists to target German football stadiums during this summer’s European Championships.

In the latest issue of the “Voice of Khorasan” magazine, a publication run by ISKP, or Islamic State — Khorasan Province, the terror organization called for jihad at Europe’s flagship football tournament, which runs for a month in Germany from June 14 until July 14.

Against a backdrop of an explosive drone flying across a football stadium, the publication used the headline, “If they restrict and oppress you on the ground, then attack them from the sky.”

“Run over the infidels with your car, hit them with a knife, with poison, or blow out their brains with bullets and set fire to their houses,” it further wrote.

German security services are understood to be treating the message as a credible threat. They are ramping up surveillance and implementing measures to combat any attempts to use drone strikes against stadiums hosting the event, which is expected to be attended by hundreds of thousands of football fans from across Europe.

The threat is the latest in a long line of menacing imagery published by terror cells to inflict fear across the continent.

Earlier this month, images circulated online of jihadists vowing to target the UEFA Champions League quarter-final games, prompting the authorities to bolster defenses at stadiums across Western Europe.

“The main question is whether these are free riders or a serious threat,” a high-ranking state security officer told Focus.

Authorities, however, are unwilling to take a risk on security and will treat the threat as credible.

“It is to be feared that other terrorist organizations such as Al Qaeda will also use their PR channels to agitate for an attack offensive in Europe and Germany,” the source added.

The Afghan splinter group of Islamic State has grown in stature in recent months to become the primary organization of concern for security officials across Europe.

A major counter-terror operation took place in the German city of Cologne before Christmas after security services in Austria, Germany, and Spain received intelligence of jihadists affiliated with the group planning to carry out several attacks at Christian landmarks including Cologne Cathedral.

Last month, two Afghan nationals with ties to the U.N.-proscribed terror cell were arrested in Germany on suspicion of planning a terror attack near the Swedish parliament to avenge the permittance of Koran-burning demonstrations in the country.

Several individuals are understood to have exploited the migratory route from Ukraine to enter the European Union to plan attacks, with Tajikistan and Turkmenistan nationals arrested in Germany in July last year having entered Western Europe from the war-torn country.

Authorities in neighboring France are also concerned about the threat of terror attacks during Paris’ hosting of the summer Olympic Games this year, and its organizers have devised a “Plan B” in case terror threats jeopardize the event’s opening ceremony.

“There is no terrorist threat to the Olympics and Paralympics today, but we will continue to monitor the situation,” Oudéa-Castéra told France 2 earlier this month.

“Just because we don’t talk about it, just because we don’t mention Plan B, doesn’t mean that it doesn’t exist.”

The terror alert level in France remains at the highest possible due to concerns over Islamic radicals and fears of retaliation against the West because of the war in Israel.