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　　Ukraine is holding ceremonies to mark the 30th anniversary of Chernobyl, the world's worstnuclear accident. Siren sounded at the exact moment of the first explosion in the plant'sreactor in April 1986, from Ukraine, Tom Burridge. Candles were lit and prayers were set in theearly hours of this morning. At the moment 30 years ago, that there was an explosion insidereactor 4 at the Chernobyl Nuclear plant. Roughly 3% of the reactor's radioactive contentescaped. Later Ukraine's president will attend another ceremony in Chernobyl to mark thedisaster which contributed to the downfall of the Soviet union   and had a huge impact on publicopinion and government policy towards nuclear energy.

　　The influentially Iraqi cleric Muqtada al-Sadr has called for a big protest today in Baghdad overthe simmering political crisis. They take place as parliament makes a fresh attempt to vote on anew cabinet after three weeks of stalemate. Ahmed Maher is in Baghdad. It is the worst politicalcrisis since the downfall of former dictator Saddam Hussein in 2003. For the past three weeks,parliament has refused to approve a new line-up of non-partisan ministers proposed by theembattled Prime Minister Haider al-Abadi. More than 100 MPs have been staging a sit-in inparliament since mid-April to express their frustration at other representatives who blockedthe vote, the even vote to sack the speaker of parliament.

　　The Canadian Prime Minister Justin Trudeau has expressed outrage of the killing of JohnRidsdel, a Canadian hostage kidnapped by Islamist militants in the Philippine six months ago.Earlier in the day, the former mining executive severed head was found in the street on aremote island. The Islamist militant group Abu Sayyaf had demanded a large ransom for hisrelease. Chrisaudi Arbes, a journalist who specializes in the threat posed by extremist groupin the region of Mindanao, says the killing is part of a change of strategy for the militants.They've become really bolder. This is the second time they've killed a foreigner. That wasn't thecase before. It wasn't like that in the past. So this one is like a message from them saying we'regoing to do what we want to do because we know we can get the money and this is our way tofight against the military.

　　A study in Britain suggests that flu vaccines are more effective when they're given in themorning rather than the afternoon. Researchers found that antibody response was strongerin those vaccinated before 11:00 AM. They say that immunizing people in tune with the body'snatural rhythm could also help improve vaccination strategies more generally and save lives.The study was based on people over the age of 65. World news from the BBC.

　　Thousands of demonstrators have been bust into the state capital of North Carolina in the USto either support or oppose a new state law that imposes restrictions on transgender people.The law demands that people use toilets in public buildings and schools that match the sex ontheir birth certificate rather than their gender identity. Both President Obama and theRepublican presidential contender Donald Trump say the law is discriminatory.

　　The Venezuelan Supreme Court has rejected a constitutional reform proposed by oppositionpoliticians who wanted to reduce President Nicolas Maduro's term in office from six to fouryears. Leonardo Rocha has more details. Since the Venezuelan opposition regained control ofparliament in December's election, it has made different attempts to oust President Maduro. Itfirst tried to call a referendum to remove Mr. Maduro from office, but that was blocked by theelectoral council. The opposition blames the left-wing policies of Mr. Maduro and hispredecessor Hugo Chavez for the shortage of food and basic items, high inflation andviolence. But Mr. Maduro says he will carry on in the next three years with his program ofsocialist reforms.

　　A French cardinal accused of covering up child sex abuse by priests has acknowledged thathis diocese made some mistakes and that victims had a right to truth and justice. CardinalPhilippe made his statement after a meeting in Lyon of more than 200 priests who had heardfrom a victim of Bernard Preynat, a priest who has admitted sexually abusing young boys over25 years ago.

　　Researchers have come up with a theory that bedbugs have favorite colors, red and black, anddislike white and yellow. The insects were placed inside Petri dishes and given a choice ofdifferent-colored bug size tents to hide in. The revelation could lead to better bedbug traps.That's the latest BBC world news.