An Indonesian Lion Air plane that crashed into the sea shortly after taking off from Jakarta on Monday had a technical problem on a previous flight, but it had been resolved according to procedure, the company's chief executive said. "This plane previously flew from Denpasar to Cengkareng (Jakarta). There was a report of a technical issue which had been resolved according to procedure," Edward Sirait told reporters, declining to specify the nature of the technical issue. He said Lion has operated 11 aircraft of the same model, the Boeing 737 Max 8, and the other planes did not have the same technical problem. Sirait said there was no plan to ground the rest of its Boeing 737 Max 8 fleet. The aircraft carrying 189 people on board is believed to have sunk after crashing into the sea off Indonesia\u2019s island of Java on Monday, soon after takeoff from the capital, headed for a key tin-mining region, officials said. Indonesia\u2019s search and rescue agency confirmed the crash of Lion Air flight, JT610, adding that it lost contact with ground officials 13 minutes after takeoff, and a tug boat leaving the capital\u2019s port saw it fall. \u201cWe don\u2019t know yet whether there are any survivors,\u201d agency head Muhmmad Syaugi told a news conference, adding that no distress signal had been received from the aircraft\u2019s emergency transmitter. \u201cWe hope, we pray, but we cannot confirm.\u201d He said that items such as handphones and life vests were found in waters about 30 metres to 35 metres (98 to 115 ft) deep near where the plane, identified by air tracking service Flightradar 24 as a Boeing 737 MAX 8, lost contact. \u201cWe are there already, our vessels, our helicopter is hovering above the waters, to assist,\u201d Syaugi said. \u201cWe are trying to dive down to find the wreck.\u201d At least 23 government officials were aboard the plane, which an air navigation spokesman said had sought to turn back just before losing contact. \u201cWe don\u2019t dare to say what the facts are, or are not, yet,\u201d Edward Sirait, the chief executive of Lion Air Group, told Reuters. \u201cWe are also confused about the why, since it was a new plane.\u201d In a statement, the privately owned airline said the aircraft, which had only been operated since August, was airworthy, with its pilot and co-pilot together having accumulated 11,000 hours of flying time.