Sri Lanka's president has replaced the country's defence secretary and taken steps to dismiss the police chief, three days after a series of suicide bombings killed more than 350 people. The authorities are facing criticism because they failed to act on intelligence which warned of possible attacks. Also in the programme: Boeing has suffered a steep fall in profits following the grounding of its 737 Max airliners, and the US space agency detects its first seismic event on Mars. Picture: Sri Lankan President Maithripala Sirisena. Credit: Lakruwan Wanniarachchi/AFP/Getty Images.

The Sri Lankan authorities are investigating whether the Islamic State Group was involved in Sunday's suicide bombings. Also in the programme: the military man now in charge of Sudan tells the BBC he's willing to hand over power within days; and the UN Security Council has adopted a watered down resolution on preventing sexual violence in conflict. (Photo credit: Reuters)

The Sri Lankan government has blamed a local Islamist group for the Easter Sunday bombings -- but says it must have had international support. Also in the programme: US says it will end exemptions from sanctions for countries that still buy oil from Iran; and our correspondent is in Libya where forces loyal to Libya's UN backed government are defending the capital Tripoli from the forces of a powerful General, Khalifa Haftar. (Photo: There were emotional scenes outside St Anthony's Shrine in Colombo. Credit: Getty Images)

Sri Lanka’s government has blamed a little-known radical Islamist group for Sunday’s attacks in which 290 people were killed. Also, Ukrainian comedian Volodymyr Zelensky has scored a landslide victory in the country's presidential election. And the US Secretary of State Mike Pompeo has said that all countries continuing to import Iranian oil will be subject to American sanctions from May. (Photo: Sri Lankan police near the site of an exploded van at a church that was attacked yesterday in Colombo. Credit: Reuters)

More than 200 people have died after a series of deadly explosions at churches and hotels in multiple locations in Sri Lankan. Also on the programme: results from the presidential election in Ukraine; and the Costa Rican-Nicaraguan immigration question. (Picture: A relative of a victim of the explosion at a church in Colombo, Sri Lanka. Credit: Reuters/Dinuka Liyanawatte)

More than 200 killed as churches and hotels targeted. (Picture: St Sebastian's Church in Negombo, Sri Lanka after a bomb blast. Credit: REUTERS/Stringer)