PM Narendra Modi will embark on a three-nation tour of Belgium, US and Saudi Arabia from tomorrow.

Modi will attend the Nuclear Security Summit in Washington, India-EU Summit in Brussels and travel to Saudi Arabia, a key partner of India in the sensitive Gulf region.

The government on Tuesday said Brussels will be Modis first stop even as the Belgian capital was rocked by a string of explosions in the which at least 34 people were killed and over 200 injured.

Besides attending the EU-India summit in Brussels, Modi will hold wide-ranging talks with his Belgian counterpart Charles Michel on a variety of issues of mutual interest.

From Brussels, Modi will leave for Washington to attend the 4th Nuclear Security Summit on March 31 and April 1 where he will be making some specific announcements and proposals with regard to nuclear security.

At the summit, India will submit a national progress report on nuclear security, External Affairs Ministry spokesperson Vikas Swarup said, adding New Delhi has contributed constructively during NSS preparatory meetings from 2014-16.

The PM is expected to hold a number of bilateral meetings during his stay in Washington.

From Washington, Modi will travel to Saudi Arabian capital Riyadh on April 2 for a two-day visit at the invitation of King Salman Bin Abdulaziz Al-Saud.