Nigerian students

Authorities in Niger state confirmed to the BBC that gunmen had seized an unknown number of students from the school in the town of Tegina on Sunday.

A teacher told the BBC that 150 students were missing, while other reports put the figure at about 200.

Abductions carried out for ransom are increasingly common in northern states.

In February nearly 300 girls were taken by armed men from a boarding school in Jangebe, Zamfara state. Most were later freed.

The attacks were prompted by the death of a local teenager due to a drug overdose. His parents blame Nigerian students for giving him the drugs.

Five Nigerian students were attacked on Monday by crowds, while another was beaten by a mob inside a shopping mall.

Police say five people have been arrested over the attacks.

Ms Swaraj said she had spoken to Uttar Pradesh Chief Minister Yogi Adityanath, and he had assured her of a "fair and impartial investigation into this unfortunate incident".