abc's jennifer eccleston with more. >> reporter: investigators scrambling to examine evidence of an alleged plot to bring down an airliner, heavily armed police summoned hazmat suits, others wearing gas masks raiding homes across sydney, australia. four men arrested. >> we believe it's islamic inspired terrorism. >> reporter: officials believe the terror plan involved an improvised device. describing the plot as credible. sources tell abc news that american intelligence officials are closely monitoring the case because of suspected communications between the alleged plotters and isis. chilling new details from the newspaper, "the australian." the suspects allegedly constructing an explosive device using poisonous gas that would kill or immobilize everyone on the aircraft. abc news has not verified this report. >> if australian media reports are correct, this would be the first time that we've seen any sort of terrorist act that involved gas on an airplane. >> reporter: airports across australia intensifying, armed patrols warning passengers of vigorous security. >> the heightened security m

. >> reporter: jennifer eccleston, abc news, london. >>> more violent clashes are expected in venezuela today as opposition leaders call for a protest against president nicolas maduro's newly elected constitution assembly. an explosion in caracas wounded at least four police officers as thousands protested yesterday to rewrite the country's constitution. electoral authorities said more than 8 million people voted in favor of maduro's power grab. one candidate up for election was shot in his home. >>> stunning images from taiwan after two typhoons hit within a 24-hour period. absolutely amazing. more than 100 people were injured after the first typhoon struck, and several parts o from the twin storms. thousands without power. those storms are triggering land slides as well. >>> now for a look at your weather. >>> there's a muddy mess to clean up across some parts of west virginia after flash flooding over the weekend. the hardest hit areas received about four inches of rain in just two hours. residents reported several feet of water in their homes and the mud left behind in some areas is

here's jennifer eccleston. >> reporter: tonight, this little boy in the middle of an international legal battle. his parents vowing to keep their son charlie alive and on life support. >> if he's still fighting, we're still fighting. >> reporter: handing over a petition with more than 350,000 signatures to their son's london hospital, urging doctors to allow charlie to receive experimental treatment in the united states. >> we feel that it should be our right as parents to decide to give him a chance at life. >> reporter: the 11-month-old can't move or breathe on his own because of a rare genetic disease. british doctors and four courts agreed treatment would prolong charlie's suffering, but late friday, an unexpected twist. charlie's doctors asked for a new hearing after hospitals in rome and new york offered new, experimental treatment options. >> there is nothing to lose. he deserves a chance. >> reporter: that chance drawing support from pope francis, and president trump. and tonight, two republican congressmen, brad wenstrup and trent franks, said they'll introduce a bill to make ch

abc's jennifer eccleston is in london with what we're learning. >> reporter: we're learning chilling new details about those four men arrested saturday in australia as part of a terrorism operation. late tonight the prime minister saying the four were plotting to bring down a plane. australian police said it was islamist inspired. they were arrested in sydney during raids earlier today. right now, we know that additional security measures are in place at airports across the country. transpo transport security officials saying screening will now take longer. all of those added security measures going into place as the counterterrorism operation continues, and at this hour, the national terror alert level remains at high. details are still coming in. we'll continue to follow this very important story. tom. >> jennifer with that breaking news from australia, thank you. >>> next tonight, the first images of north korea's ominous new missile launch. a rare nighttime launch. that traveled higher and longer than any other previous attempts. now, potentially able to strike deep into the u.s.

we begin with jennifer eccleston. >> reporter: tonight investigators scrambling to find evidence of an alleged plot to bring down an airliner. heavily armed police, some in haza hazmat suits, others in gas masks, raiding homes across sydney, australia. four men arrested. >> we do believe it is islamic-inspired terrorism. >> reporter: officials believe the terror plan involved an improvised device, describing the plot as credible. sources tell abc news that american intelligence officials are closely monitoring the case, because of suspected communications between the alleged plotters and isis. also tonight, chilling new details from the newspaper, "the australian." the suspects constructing an explosive device using poisonous gas that would kill or immobilize everyone on the aircraft. abc news has not verified this report. >> if australian media reports are correct, this would be the first time we have seen any sort of terrorist act that involved gas on an airplane. >> reporter: the department of homeland security are assisting partners overseas and have taken extraordinary steps to pr

jennifer eccleston, abc news. >>> a massive manhunt under way for four escapees from alabama. some of them have a history of violent crime. 12 inmates escaped. eight of the inmates were recaptured on sunday night. no word an how they escaped. >>> a search is under way for a suspect involved in a murder in minneapolis. police searching for lucifer vincent nugent. police say the suspect crashed his car and ran into a senior living facility. that center was evacuated. a nearby shopping center was also evacuated. >> the last information we got was that he entered in there and said something to some of the employees. presumed by the time we had the perimeter set up he was already gone. >> police say the suspect is considered armed and dangerous. >>> president trump is refusing to give up on health care reform, after the failed efforts last week. the president urged republican senators to keep working, tweeting that the world is watching. after saying let obamacare implode, he threatened to end what he called bailouts. white house aides say the president will decide whether to stop