Swedish prosecutors have filed terror charges against two men accused of plotting suicide attacks in Somalia.

Investigators say the men, aged 22 and 26, belonged to the Somali al-Qaida-linked insurgent group al-Shabab.

They were charged Friday at the Goteborg District Court in southwestern Sweden for plotting to commit suicide attacks causing "widespread destruction."

The younger suspect is a Swedish citizen, while the nationality of the other was not clear.

Police arrested them in May and June as part of an investigation into Somalia-linked terrorism activities in the Nordic country.

Sweden raised its terrorism threat level on Friday based on a classified intelligence assessment, but authorities said an attack was not imminent and the threat was still low compared to other European countries.

The Swedish Security Service said it had raised the estimated threat level for terrorism targeting the country to "elevated" from "low", based on a review of security by the National Centre of Terrorist Threat Assessment.

Political violence is rare in Sweden, which has roughly 500 troops stationed in Afghanistan as part of a NATO-led force.

Some Swedish officials believe Sweden, and many other western countries, are at risk of going out with a whimper because of the influence of Islam, drawing a connection to 1400 years of Muslim aggression.

Islamification, in the minds of the Muslims, is a simple matter of destiny for the entire western world. And despite the claim that there are moderate Muslims, in the end all Muslims hold to the ideology of Islam, and believe that the destiny of the planet is for all nations to fall under Sharia law.

It’s a political ideology masking as religion. Religion as Americans view it does not aim to change the law, and institute a theocracy in the place of the host's governmental system, as is the aim of Islam.

One Swedish official is quoted as saying, ". . . when the Islamists came to power [in Iran], they wiped out the socialists too. And I’m saying that if we don’t take the Islamification that’s taking place in western Europe right now seriously, maybe history will repeat itself."

He continued, "Sweden is being Islamified right now. We’ve taken up countless examples of how Sweden is adapting to Muslim demands and we’re seeing how mosques are popping up like mushrooms from the ground in Sweden and all over Europe. It’s not necessarily the case that we’ll all become Muslims, but that we will have to obey Sharia. . . Through Muslim immigration and rapid propagation, as well as through Turkey’s membership in the EU, Europe can become dominated by Muslims."