The attack by up to 50 terrorists took place at a plant run by the MOL Pakistan Oil and Gas Company in Hangu district near the Afghan border.
"Our intelligence services have reason to believe that an assault with an Islamist motive is planned to be carried out in Vienna," Vienna police said in English on Twitter.
For a decade, offensive efforts have failed to stop an Islamist insurgency that has killed thousands and displaced millions.
The palace issued a statement explaining the importance of the decision to normalize relations with Israel while, at the same time, retaining a clear focus on the Palestinian issue.
Secretary of the Somali Defense Committee Ahmed Abdi Koshin says military offensive has 'successfully dislodged' the al-Qaeda-linked terror organization from many parts of the country.
The mass kidnapping is a first in the insurgency that spread to Burkina Faso from neighboring Mali in 2015 despite costly international military efforts to contain it.
The attack is the latest example of the growing insecurity that has spread to nearly every corner of Africa's most populous country.