'The Claws of Lorelei') is a 1973 Spanish horror film written and directed by Amando de Ossorio,[1] and starring Tony Kendall,[2] and Helga Liné.

In a small German village near the Rhine river, a nearby boarding school is plagued by a series of grisly murders of its female students every full moon.

Locals in the area blame the killings on a legendary water spirit known as The Lorelei, which is said to reside in a grotto beneath the Rhine river, and transform from a beautiful woman into a reptilian monster that hungers for human blood every full moon.

[7][8] It was famously rereleased a few years later under the title When the Screaming Stops, with distributor Independent Artists adding a "Shock Notice" gimmick where red warning flashes preceded each gory murder.

[15] TV Guide rated the film 2/5 stars, stating, " this odd blend of German legend and '70s Euro-horror conventions is distinguished by the red flashes that precede each gory murder.

"[16] The Terror Trap gave the film 2.5 out of 4 stars, calling it "a fairly gory spanish dish, with some nice heart rippings, an attractive cast and a cool creature feature mood".

Digital Retribution awarded the film a score of 4/5, calling it, "a masterful work of horror which has been shamefully overlooked, both by the audience of its time, as well as today's Saw-hungry crowds".

[20] Samm Deighan of Diabolique Magazine noted the film's script, while "a total mess" but felt that it was refreshing, writing, "If you’re expecting something atmospheric and doom-laden, think again.