The abductors, who are believed to be foreign nationals, accessed the gym through gates that are believed to have been left open deliberately, Dar es Salaam regional police commissioner Lazaro Mambosaso told CNN.
Earlier, Mambosasa told reporters in Dar es Salaam that abductors covered their faces during the terrible event in the city.
Police have already made some arrests.
Dewji runs MeTL, a multi-establishment company operating in six African countries which was founded by his father in the 1970s.
Mr Dewji is ranked 17th by Forbes on its list of Africa's billionaires.
Portal: New home device from Facebook And when there are more people in the room, the camera will automatically enlarge its field of view to 140-degrees to include all. A camera cover will also be provided to block the camera at anytime along with a passcode to prevent unauthorized use.
Mr Dewji is also a major sponsor of one of Tanzania's biggest football teams, Simba.
He also served as a member of parliament for the ruling Chama cha Mapunduzi party from 2005-2015.
In 2013, he became the first Tanzanian to grace the cover of Forbes magazine and was named Forbes Africa Person of the Year in 2015.
Mr Dewji, locally known as Mo, is credited with turning his family business from a wholesale and retail enterprise into a pan-African conglomerate, reports the BBC's Athuman Mtulya from Dar es Salaam. According to Forbes, the billionaire signed the Giving Pledge in 2016, promising to donate at least half his fortune to philanthropic causes.
"All our borders in and out of the Dar es Salaam region are being monitored to make sure the cars involved are stopped or confiscated and the culprits are brought to justice as soon as possible", Regional Commissioner Paul Makonda said at a news conference.
A magnitude 6.2 aftershock was recorded over an hour after the original quake struck, according to the U.S. The quake's epicenter was located around 200 kilometers southwest of Rabaul at a depth of 40 kilometers.
Unlike Meghan and Harry, Eugenie and Mr Brooksbank cut their carriage procession short, cutting out parts of the high street. The ceremony took place at a private estate in Hidden Hills, Calif., and was reportedly a low-key affair.
In recent years, the club have allowed a number of top performers to run down their contracts in order to negotiate a better deal. Ramsey scored in Arsenal's 5-1 win over Fulham at the weekend and has made over 300 appearances for Arsenal in all competitions.
The gaming smartphone packed with the same Non-removable Li-Po 4,000 mAh capacity battery inside the body like its predecessor . Razer says that the phone is the only one that supports Netflix certified HDR video with Dolby Digital 5.1 surround sound .
In terms of memory, the device features 512MB RAM and 4GB of internal storage , which is further expandable via a microSD card. With the Nokia 3.1 Plus, HMD Global is stepping in the crowded segment where there are a number of options already.
Popular Mechanics reports that Thursday's launch is the fourth time that a ballistic re-entry has occurred in the Soyuz program. In 2015, CRS-7 launched a Dragon capsule on a Falcon 9 rocket to resupply the space station, but the second stage exploded.
Nintendo promises that these special save points will offer "fun new entry points into fan-favorite games". Speedrunners will probably have a good time getting through the game with these special boosts as well.
The document stated that the UK Government "expects" this arrangement to remain in place no later than the end of December 2021. This date is the end of the transition period negotiated by the United Kingdom as part of the divorce deal with the EU.
Fury won two tune-up bouts, in June and August, and then signed to face Wilder in one of the year's most significant fights. Loud megafit in the heavyweight division between DevTeam Wilder (40-0, 39 KO's) and Tyson fury (27-0, 19 KO's) in jeopardy.
He chose to take the tough decision to snub a Pep Guardiola-managed Manchester City and has proven his doubters wrong. As a result, the 18-year-old was given his first England call-up in the upcoming matches against Croatia and Spain.
DBT is a talking treatment based on cognitive behavioural therapy that is used to develop new coping skills. During her second hospital visit, Gomez reportedly suffered an emotional meltdown.
With deal on judges, Senate goes home for the elections
Brett Kavanagh of Louisville, Kentucky, shares the same name as the new Supreme Court Justice but not the same spelling. But the Kavanaugh confirmation, as bitter and divisive as it was, was seen by many analysts as a victory for Trump .
Amazon tosses free Echo Dot in with two new Xbox One bundles
And lastly, Narrator is getting upgraded with support for five new languages: Spanish, Portuguese, Polish, Swedish, and Dutch. Dolby Vision HDR video streaming has been implemented as well, supported on Netflix with a premium subscription.
Record-breaking Hurricane Michael batters Florida Panhandle
Though most homes were still standing, no property was left undamaged. "It looks like a tornado came through here", he said. After daylight Thursday residents of north Florida would just be beginning to take stock of the enormity of the disaster.
Essential turns focus to AI-driven phone with virtual agent
Rubin has already achieved one of the biggest feats by the laying the foundation of the modern smartphone business with Android. Given that Essential hasn't been performing well in the market and has received several setbacks in recent times.
Hurricane Michael crashes into Florida Panhandle
Roy Cooper warned that Michael could bring moderate storm surge, downed trees and power outages to his sodden state . Torrential downpours and flash flooding from the storm over the weekend caused 13 deaths in Central America.
Despite poor start, the Giants have shot in weak NFC East
Manning has completed 3 of 12 passes thrown 20 or more yards downfield this season entering Sunday. "It was a big week for us". An interview with ESPN in which Beckham managed to steamroll first-year coach Shurmur and quarterback Eli Manning .