PSNI chief constable George Hamilton has praised his officers' handling of the investigation into the Greenvale Hotel deaths in Cookstown.
Three teenagers died following a crush outside the hotel.
It emerged last week that police officers who initially responded are to face investigation after it emerged they initially withdrew from the scene.
Mr Hamilton referred the actions of the officers to the Police Ombudsman.
Read More: Greenvale Hotel deemed 'unsatisfactory' in third of entertainment licence inspections
The chief constable said today: "The organisation I am responsible for as far as I am concerned is competent in this matter.
"The investigation team and local police have done a good job, not to be self-congratulatory in such tragic circumstances.
"It is a human endeavour and sometimes judgments are not quite right."
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Co Tyrone schoolchildren Morgan Barnard (17), Lauren Bullock (17), and Connor Currie (16), died following a crush near the entrance to the Greenvale Hotel in Cookstown on St Patrick's Day.
Ombudsman Dr Michael Maguire is examining how police responded when the first emergency call was made at around 9.30pm.
The police were also criticised after refusing to apologise for arresting Greenvale Hotel owner Michael McElhatton on suspicion of drugs offences and later "de-arresting" him.
Mr McElhatton, who was arrested on suspicion of manslaughter, accused the PSNI of trying to “blacken his name”.
The 52-year-old was being questioned by police in Dungannon when he was arrested separately on suspicion of possessing a class-A drug with intent to supply. Hours later he was “de-arrested” after a “fast-track forensic examination of a suspicious package consisting of white-powder substance and tin foil” ascertained the powder to be “an innocent substance”.
