Police arrested five Tunisians on charges they disseminated jihadist propaganda and bomb-making tips via the Internet, Spain's Interior Ministry said Wednesday.

The suspects uploaded more than 400 files with text, still photos and video of attacks and speeches by the late Osama bin Laden and other prominent terrorists, the ministry said in a statement.

The Barcelona-based group also posted instructions for making explosives and information on the training of jihadist militants.

Authorities began monitoring the five Tunisians in early 2012 and noticed "a strong process of self-radicalization" among some of them, the Interior Ministry said.

The process "has brought them to fully embrace the thesis of jihadist Salafism" and accelerated after one of them visited Tunis earlier this month, according to the statement.

More arrests may take place in connection with the ongoing security operation, dubbed "Carthage," the ministry said.

Salafism is a fundamentalist current within Islam. EFE