The PM said that countries sponsoring, aiding and funding terrorism must be held accountable.
The suspicious van was wanted over the terror attacks and was taken into custody at Sungavila.
The names of both Maregowda and Puttaraju had figured in the list of missing Janata Dal-Secular workers tweeted by Chief Minister H D Kumaraswamy on Monday.
Several people succumbed to their injuries sustained in the blasts, taking the death toll to 359.
Religious leaders from various faiths assembled on Thursday for a prayer meeting to express support for and solidarity with a 71-year-old nun whose gang-rape at a convent school in West Bengal's Ranaghat sent ripples across the country.
Forty suspects, including the driver of a van allegedly used by the suicide bombers, have been arrested in connection with the attacks which shook Sri Lanka.
National flags were lowered and people bowed their heads as the silence began at 8:30 am local time, the time the first of the attacks occurred on Sunday.
The best in international photojournalism was recently announced by World Press Photo's Annual Photo Contest. Despite fierce competition, the jury was forced to select just a handful of images from more than 73,044 photos by 4,548 photographers across 125 different countries. This year's grand prize was awarded to Venezuelan photographer Ronaldo Schemidt, earning him the title of Press Photographer of the Year. Here are some of the winners.
Authorities also released photographs of six suspects, including three women, wanted for their involvement in the attacks and sought information regarding them from the public.
Even as the polity find ways and means to address the genuine concerns and fears of the society, the Sri Lankan State apparatus would have to unravel these mystery-questions with convincing answers, and a road-map to the future, says N Sathiya Moorthy.
You won't regret including this list in your itinerary.
Israel is no longer the valiant and beleaguered underdog, but increasingly seen as an increasingly arrogant oppressor seeking to crush another old nation under its jackboots, says Mohan Guruswamy.