Germany's Social Democrats (SPD) party Berlin headquarters have been evacuated after receiving a bomb threat this afternoon.

SPD general secretary Yasmin Fahimi told German media the party had received a bomb threat at 3pm local https://twitter.com/BILD/status/636176217134252032

It is thought the bomb threat was made in relation to party chairman's Sigmar Gabreal's visit to the Heidenau, a town in the east of the country that has been caught up in Germany's migrant crisis.

An asylum centre was opened at the weekend, following two nights of protests by locals, which resulted in clashes with police.

Tensions over Germany's migrant crisis are rising, as authorities estimate up to 800,000 people will seek asylum by the end of the year.

"Since Sigmar Gabriel's visit to Heidenau there have been a flood of threats reaching the Willy Brandt Haus combined with xenophobic hate speech," said Ferhimi is quoted as saying. "We have to assume that this is a purely political act."

SPD has received “a flood of threats with racist overtones” since his visit, Reuters said.

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More to follow..