The suicide bombers who killed at least 359 people in Sri Lanka’s Easter Sunday terror attacks were largely well off and included one who studied law in Australia, officials said Wednesday.

“Some of the suspected bombers, most of them are well-educated and come from maybe middle or upper-middle class, so are financially independent and their families are quite stable,” Sri Lankan Junior Defense Minister Ruwan Wijewardene told reporters of the eight men and one woman who government officials believe to be behind the carnage.

Perhaps none fits that bill more than brothers Inshaf and Ilham Ahmed Ibrahim, sons of prominent Sri Lankan spice exporter Mohamed Ibrahim, according to Indian outlet Firstpost, which citing intelligence sources identified the siblings as two of the attackers.

Carrying virtually identical backpacks stuffed with explosives, Inshaf, 33, and Ilham, 31, entered two hotels in the coastal capital of Colombo on Easter Sunday morning.

Standing at the hotels’ bustling breakfast buffets, the brothers detonated their deadly loads within minutes of each other, two of six near-simultaneous blasts that killed at least 359 people and wounded at least another 500 in the island nation’s hotels and churches.

In the chaotic hours after the first and largest wave of explosions, Sri Lankan cops traced the brothers back to a family home using an address one used at hotel check-in, and stormed inside.

That’s when the wife of one of the brothers triggered a blast of her own, killing herself, her two kids and three police officers, Agence France-Presse previously reported.

Now dad Mohamed Ibrahim and a third son, Ijas, are among at least 60 people being interrogated by cops in Colombo, Firstpost reported.

The founder of Colombo-based Ishana Exports and his brood are “very well connected, very rich, politically connected as well,” neighbor Pamuditha Anjana told CNN.

But Hilmy Ahamed, vice president of the Muslim Council of Sri Lanka, said that he believed the spice tycoon — a prominent member in Colombo’s small but tight-knit Muslim community — was too focused on his business empire to notice his sons’ apparent radicalization.

“He was a busy businessman,” Ahamed told CNN. “He probably totally neglected what was happening around him.

“I doubt he had knowledge.”

Ahamed added that Ibrahim’s sons were “well-educated overseas,” a trait they shared with another bomber identified Wednesday.

“One of them we know went to the UK, then went to Australia for a law degree,” said Wijewardene of one suspect, identified by sources to Sky News as Abdul Lathief Jameel Mohamed.

Mohamed studied in southeast England between 2006 and 2007, before taking postgraduate classes in Australia and eventually resettling in Sri Lanka, the news outlet reported.

Also identified Wednesday was factory owner Inshan Seelavan, described by Sri Lankan presidential adviser Shiral Lakthilaka as not only a bomber but the attack “mastermind” — a moniker at odds with earlier government claims that Zahran Hashim was the ringleader.

Seelavan detonated his explosives at Colombo’s Shangri-La Hotel, and is confirmed dead.

Hashim, the fiery, West-hating cleric at the helm of local terror cell National Towheed Jama’ar, is also thought to have been a bomber, though his death has not been officially confirmed.

Sri Lankan authorities initially pinned the blame for the bloodshed on Hashim’s group and another local group, Jammiyathul Millathu Ibrahim, but ISIS on Tuesday stepped forward to claim responsibility.

US Ambassador to Sri Lanka Alaina Teplitz said Wednesday that claims of outside help for the two homegrown groups appear more valid the deeper that local and international investigators dissected the bombings.

“If you look at the scale of the attacks, the level of coordination, the sophistication of them, it’s not implausible to think there are foreign linkages,” Teplitz told reporters. “Exploring potential linkages is going to be part” of the investigation.

Meanwhile on Wednesday, Sri Lankan officials promised a swift overhaul among the country’s security leadership, amid troubling admissions that intelligence operatives had enough information to prevent the bombings as early as April 4, but failed to act.

Sri Lankan President Maithripala Sirisena requested the resignations of his national police chief and defense secretary.

“I will completely restructure the police and security forces in the coming weeks,” the president said in a nationally televised address.

Parliamentary leader Lakshman Kiriella, meanwhile, accused some senior officials of deliberately keeping potentially lifesaving intelligence to themselves amid fierce government infighting.

“Some top intelligence officials hid the intelligence information purposefully,” he told parliament. “The top-brass security officials did not take appropriate actions.”

Wijiwardene agreed.

“It is a major lapse in the sharing of intelligence information,” he said in a press briefing. “We have to take responsibility.”

With Post wires