Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: PRAGUE (AP) — The mystery behind a booby-trapped safe that exploded and killed the Palestinian ambassador has kept investigators working around the clock Thursday. 
  
 Firemen lay on the ground near the residence of Palestinian ambassador to the Czech Republic, Jamel al-Jamal, in Prague on Wednesday, Jan. 1, 2014. The ambassador died in an explosion that occurred... (Associated Press) 
  
 Investigators observe the situation in the residence of Palestinian ambassador to the Czech Republic Jamal Al Jamal, who has died after an explosion in his diplomatic flat in Prague-Suchdol on Wednesday,... (Associated Press) 
  
 FILE - In this Oct. 11, 2013 file photo Palestinian ambassador to the Czech Republic Jamal Al Jamal is pictured in Prague, Czech Republic. Jamal Al Jamal, who was injured in an explosion in his residence... (Associated Press) 
  
 As the probe deepened, more unanswered questions arose over conflicting statements coming from Palestinian officials — namely, was the former Palestinian Liberation Organization safe in constant use at the Prague embassy, and if so, what made it explode? 
  
 Ambassador Jamal al-Jamal, 56, died Wednesday of massive injuries from the blast. The career diplomat had only started his posting in October. 
  
 Police spokeswoman Andrea Zoulova said it appeared that the door of the safe had been booby-trapped, but it was unclear how al-Jamal tried to open it or what type of safe it was. It was also unclear what caused the safe to explode. 
  
 Zoulova told The Associated Press on Thursday that nothing had been found to suggest the diplomat had been a victim of a crime, but she declined to elaborate. 
  
 Weapons, however, were found and were considered illegal because they were not registered, Zoulova said. It was unclear what type of weapons were found at the complex. 
  
 The country's counterintelligence service, BIS, said the death didn't appear suspicious. Prime Minister Jiri Rusnok called the death "an unfortunate and tragic event." 
  
 Palestinian Foreign Minister Riad Malki also said no foul play was suspected. 
  
 Malki, however, said Wednesday the safe had been left untouched for more than 20 years and that the ambassador opened it to see what it contained. But Palestinian Embassy spokesman Nabil El-Fahel told Czech radio Thursday it had been in constant use. 
  
 "(The safe) was used on a daily basis at the embassy and it was opened and closed almost every day," he said. 
  
 The safe was recently moved from the old embassy building, but it had come from a building that used to house the PLO's offices in the 1980s, Malki said. 
  
 The PLO had offices in Prague in 1976 but it obtained diplomatic status in 1983 when it was officially recognized. 
  
 During the Cold War — before the fall of the Soviet Union — the PLO had close ties with the Eastern bloc countries. 
  
 Several members of the PLO were linked to terror attacks during the Cold War. 
  
 Pavel Kolar, the head of Prague's Institute of Criminology, said Thursday that their investigation would take several days at least. 
  
 The death was being investigated as a case of negligence and possession of illegal armaments. 
  
 The embassy recently moved to a new complex, and the safe was in the ambassador's residence. 
  
 A team of Palestinian experts is expected to participate in the investigation. 
  
 Security analyst Andor Sandor said it would be unusual to protect embassy documents with a booby-trapped device. 
  
 During their search, police discovered one more safe at the embassy complex but no explosives were found. ||||| An investigator works at the site of an explosion in Prague January 1, 2014. 
  
 A firefighter works at the site of an explosion in Prague January 1, 2014. 
  
 Investigators works at the site of an explosion in Prague January 1, 2014. 
  
 PRAGUE/GAZA The Palestinian envoy to Prague was 'deliberately killed', his daughter alleged on Thursday, a day after he died in a mysterious explosion after opening a safe in his residence. 
  
 Czech police said the blast that killed ambassador Jamal al-Jamal might have been caused by mishandling an explosive securing the safe. They said they were not treating it as an attack or a terrorist incident. 
  
 In a further twist, investigators found unlicensed weapons at the Palestinian diplomatic mission, and the Czech foreign ministry said it would demand an explanation. 
  
 Jamal suffered lethal injuries to his head, chest and abdomen in the explosion on New Year's Day. His daughter Rana al-Jamal, 30, told Reuters: "We believe my father was killed and that his death was something arranged and not an accident. How? We do not know and that is what we want to know." 
  
 Jamal had been in Prague only since October but had previously served at the mission for two decades from the mid-1980s, the daughter said. He had used the safe during that period and it remained in Prague when he left, she added by telephone from Ramallah in the West Bank. 
  
 The Palestinian mission is in the process of moving into a new embassy and residence, which share the same compound. Jamal was killed at the new residence. 
  
 "The safe was emptied and moved to the house. My father had been putting documents inside it and it was open," Rana al-Jamal said. "The explosion took place while he used it." 
  
 She said her mother, who was there at the time, had told her the safe had not been badly damaged. 
  
 Nabil el-Fahel, a spokesman for the Palestinian mission, said the safe was being used on a daily basis to store cash. 
  
 Some safes can be fitted with small charges to destroy secret documents in the event of the lock being tampered with. 
  
 But Fahel said embassy staff were not aware that any explosive mechanism was attached to the safe that Jamal opened. 
  
 WEAPONS FIND 
  
 Prague police chief Martin Vondrasek told Czech Radio that investigators had found weapons at the mission that were not registered with local authorities. He did not reveal the quantity and type. 
  
 A Palestinian official, speaking on condition of anonymity, told Reuters that the mission's staff had submitted the arms to the Czech authorities. He did not elaborate on the type of weapons involved, but said they had been retrieved from an old sack and had been untouched since Cold War times. 
  
 The Czech foreign ministry said it was concerned by the discovery. It said diplomats' weapons were subject to local laws on arms, which require registration and licensing. 
  
 "The ministry is concerned that among evidence... were weapons not registered in the Czech Republic," the ministry said in a statement. 
  
 "In such case, the Vienna Convention on diplomatic relations may have been breached and we will demand an explanation," it added, referring to the international rules that govern the activities of diplomats and embassies. 
  
 Communist Czechoslovakia maintained friendly relations with the Palestine Liberation Organisation in the 1980s, but the Czech Republic, an EU and NATO member country, has been supportive of Israel. 
  
 (Additional reporting by Nidal al-Mughrabi in Gaza and Ali Sawafta; Writing by Jan Lopatka and Jason Hovet; Editing by Mark Trevelyan) ||||| Accident Or Not? Palestinian Diplomat's Death Is A Mystery 
  
 Enlarge this image toggle caption Filip Singer /EPA/LANDOV Filip Singer /EPA/LANDOV 
  
 Was the Palestinian ambassador to the Czech Republic killed by accident or are the circumstances of his death on Wednesday more nefarious? 
  
 There are more questions than answers about Jamal al-Jamal's death now that a spokesman for his embassy has told Radio Prague and Reuters that a safe the ambassador had opened just before something blew up had not been intentionally fitted with explosives and had been used frequently in recent years. 
  
 Those details conflict with the early word from authorities — that the safe hadn't been opened for about 20 years and may have been rigged with a booby trap to thwart would-be thieves or enemies. The implication from those reports was that the diplomat may have been the victim of an unfortunate accident. 
  
 The implication to be drawn from today's comments by embassy spokesman Nabil el-Fahel is that something more sinister may have happened. 
  
 There are other theories, as well. According to The Associated Press, al-Jamal may have taken some things out of the safe before the explosion. So, it's possible that something he removed was responsible for the blast. 
  
 And we should add this news to the mysterious mix: Reuters reported Thursday that Czech police have found weapons in the Palestinian diplomatic outpost. The wire service said authorities have not released details about what was discovered. 
  
 The main source for the report that the safe may not have been touched for 20 years or more and may have been booby-trapped was Palestinian Foreign Minister Riad Malki. The safe had been moved recently from old offices of the Palestinian Liberation Organization to a residence in a new embassy complex. 
  
 But according to Reuters, embassy spokesman el-Fahel says "the safe was being used almost daily for depositing money ... used for salaries of embassy staff, for buying items for daily operations. ... Minister Malki had mistakenly spoken about a second safe ... that was empty and almost never used." 
  
 As for the events immediately before and after the 56-year-old al-Jamal's death, The Associated Press writes that: |||||
Output:
The plot thickened today around the mysterious explosion that killed Palestinian ambassador Jamal al-Jamal in Prague. Initially, reports had indicated that Jamal had opened a booby-trapped embassy safe—one that the Palestinian Foreign Ministry said hadn't been opened in more than 20 years. But an embassy spokesperson has since told Radio Prague and Reuters that the safe was "opened and closed almost every day," and hadn't been fitted with any explosive devices. That, NPR explains, suggests "that something more sinister may have happened." But that's not all. Czech police investigating the incident also found a cache of unregistered weapons in the Palestinian embassy, so police are now investigating the incident as a case of negligence and possession of illegal armaments, the AP reports. One Czech website reported that there were enough guns to outfit a 10-member squad, including a sub-machine gun.