Sri Lanka has been under a state of emergency since the April 21 attacks which killed 258 people, including 45 foreign nationals, and wounded nearly 500 people. (Photo: AFP)

The international police organization, based in the French city of Lyon, said in a statement that one of the alleged ringleaders in the April 21 bomb attacks in Sri Lanka has been arrested following the publication of an Interpol Red Notice.

A so-called "red notice" is a request to law enforcement worldwide to locate and provisionally arrest a person pending extradition, surrender, or similar legal action.

Interpol identified the alleged ringleader as Mohamed Milhan, a senior leader of the National Thowheeth Jama'ath (NTJ) jihadist group.