Some parts of the island received up to 9in (23cm) of rainfall in a matter of hours on Tuesday evening.
In an emailed statement, the British government's Foreign Office said: "We are supporting the family of two British people following their deaths in Spain, and will do all we can to assist them at this deeply hard time".
Marks on the walls showed flood waters reached up to a height of at least a metre (three feet).
Emergency services in the archipelago updated information regularly on Twitter, sending out tweets in Spanish, Catalan, English and German in an indication of the prevalence of tourists and foreign residents on the island.
The deputy mayor of the town, Antonia Bauza, confirmed to Cadena SER radio that two others killed in the area were locals.
Tennis star and local lad Rafa Nadal helps in the clean-up efforts. The biggest numbers came from Germany and Britain.
The missing child had been in a vehicle in Sant Llorenc with his mother, who was one of those killed, a spokesman for the central government's representative in the Balearic Islands said.
Samsung launches phones with quad, triple cameras But will that be the reality? What do you think about the new Galaxy A9's price? You'd be forgiven for getting a bit confused. The Galaxy A9 (2018) might not be a flagship, but it keeps pace with its more powerful siblings in more than a few ways.
Saudi Arabia to let Turkey search its Istanbul consulate Responding to Saudi claims that the cameras were not functioning on October 2, Erdoğan said this was not a logical explanation. Suspicions are mounting that Saudi's crown prince ordered the murder of Saudi journalist Jamal Khashoggi in Turkey.
Many more foreigners live in the archipelago.
The 17-time Grand Slam victor also provided shelter at his tennis academy in Manacor for displaced people whose homes were severely damaged by the flash flood.
"Our most honest condolences to the loved ones of the victims of the serious floods in San Llorenc", he wrote.
Local television showed footage of beach umbrellas floating in the sea near S'Illot, one of the affected coastal villages.
"What is most urgent right now is to find missing people and address the concerns of their relatives and all neighbours", Prime Minister Pedro Sanchez said during a visit to the disaster zone.
Spain's central government "has taken the first steps to ensure that those affected receive the necessary help as soon as possible", government spokeswoman Isabel Celaa told reporters following a weekly cabinet meeting.
Spanish lawmakers observed a minute of silence in parliament in memory of the victims.
About eight hours after landfall, Michael was downgraded to a Category 1 storm, with top sustained winds of 90 mph (150 kph). The remainder of Georgia, the Carolinas, and southern Virginia...3 to 6 inches, with isolated maximum amounts of 8 inches.
More than 8 inches of rainfall fell in just a few hours on Tuesday morning, according to the Spanish weather company Aemet. After opening his academy to flood victims, Rafael Nadal volunteered to help clear homes of water and mud.
Fueled in part by above-average water temperatures in the Gulf of Mexico, the storm rapidly intensified at the start of this week. Residents of the neighboring state of Georgia should also expect to be heavily impacted by the storm, the FEMA head said.
USA consumer price inflation is now above 2 percent annually and the unemployment rate is the lowest in about 40 years. The president said of the market losses, "Actually, it's a correction that we've been waiting for a long time".
Assuming the team can rescue the malfunctioning gyroscope, Hubble will resume operations in its standard three-gyro configuration. If Hubble breaks down completely before that date, astronomers will be without a space telescope.
The blast Tuesday evening shut down the Enbridge natural gas pipeline about 600 miles northeast of Vancouver. The company will update its customers as soon as it is in a position to offer something new, said Stout.
The Nokia 3 .1 Plus sports a 5.99-inch HD+ IPS display with an aspect ratio of 18:9 and for a change, does away with the notch. With all of these in mind, we simply don't see why the Nokia 7.1 can't be that budget Pixel 3 XL but with a different name.
There's no cure and some children appear to have long-term disabilities, while others recover completely or almost completely. Additionally, the CDC has found a possible link between an increase in a respiratory virus and an increase of AFM.
Trump Takes Swipe at Fed as Stocks Tumble
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Selena Gomez receiving mental health treatment
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AP Analysis: Missing writer shows Saudi Arabia's dark side
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Prince George and Princess Charlotte to star in Royal Wedding
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Sears could file for bankruptcy as soon as this week
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Murkowski on Trump: I know Alaska 'better than he does'
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