Shopping website Amazon is now reviewing procedures after it was found that it may be accidentally giving tips to bomb-makers.
The website allows users to see what other people have often bought together, and this includes those items which could potentially make an explosive device.
It has been found that some chemicals on the website are often paired with other materials used in bombmaking in the suggestions, according to CBS.
Some chemicals are also paired with other dangerous materials that can be used to increase the impact of the explosion.
It is thought that these suggestions are being shown due to data from amateur fireworks-makers and scientists making purchases on the site.
Former British Army officer Chris Hunter said this could help those who are radicalised individually and are “off the radar.”
If they are unsure of all the components of an explosive device they may be able to find "that missing ingredient and that missing part of the jigsaw” through the “frequently bought together” feature.
However, there is no evidence to show that extremists who have created bombs have actually used materials bought online.