Ms Swaraj also re-tweeted emergency numbers in Barcelona given by the Indian Embassy.
"I am in constant touch with Indian Embassy in Spain @IndiainSpain. As of now, there is no report of an Indian casualty," she tweeted.
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.