LONDON (AP) — The Latest on the suicide bombing at a pop concert in Manchester (all times local):

11:05 a.m.

The head of Britain's domestic intelligence agency has canceled his attendance at an international anti-terrorism meeting.

MI5 chief Andrew Parker pulled out of the upcoming meeting in Berlin following the deadly attack on a pop concert in Manchester.

British authorities believe a suicide bomber carried out the attack that killed 22 and wounded dozens in the city in northwest England on Monday.

Germany's domestic intelligence agency confirmed Parker's cancellation to The Associated Press on Wednesday.

The May 29 meeting in Berlin is titled "Western democracies' responses to the threat of Islamist terrorism" and also features senior intelligence officials and experts from Europe and Israel.

Parker's attendance at the meeting would have been a rare public appearance for the MI5 chief.

10:55 a.m.

Britain's defense ministry says the changing of the guard ceremony at Buckingham Palace has been cancelled so that police officers can be re-deployed in the wake of the Manchester concert attack.

The traditional ceremony at the palace in London is a major attraction that draws crowds of tourists.

Officials also announced Wednesday that the Palace of Westminster, which houses the British Parliament in London, will be closed to all without passes. That comes after Britain's national security threat level was raised to "critical," the highest level, following Monday's attack in Manchester.

All tours and events at Parliament were immediately cancelled until further notice.

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10:35 a.m.

Police in Manchester say they have arrested three more men in connection with the suicide bombing at a pop concert that killed 22 people.

They said Wednesday the arrests had been made in the south of the city, where a day earlier a 23-year-old man was also arrested and a number of homes were searched.

Police are trying to establish if bomber Salman Abedi acted alone or whether there could be a risk of further attacks.

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10:05 a.m.

Israel's defense minister says he doubts the devastating bombing in Manchester will have any impact on European counterterrorism tactics because of the continent's "politically correct" character.

Avigdor Lieberman says every bombing in Europe results in much talk, but little action. He told Israel's Army Radio Wednesday the problem is extremism among Muslim youths who are not integrated into society.

He said nothing will change until these residents are ready to adopt "universal, European values."

At least 22 people were killed in Monday evening's attack at an Ariana Grande concert. The bomber, Salman Abedi, was British-born and of Libyan descent. The official threat level in Britain has since been raised to its highest point.

Lieberman says Israel and Britain enjoy close intelligence cooperation and Israel offered its assistance following the attack.

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9:55 a.m.

Prime Minister Theresa May is chairing a meeting of her emergency security cabinet, known as Cobra.

The Downing Street meeting is dealing with intelligence reports about the investigation into Manchester suicide bomber Salman Abedi.

Police and intelligence agencies are trying to determine if he was part of a network that may be planning further attacks in the coming days.

Home Secretary Amber Rudd has criticized U.S. officials for leaking information about Abedi to the press as the investigation is unfolding.

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9:35 a.m.

Poland's foreign minister says that a Polish couple were killed in the concert blast in Manchester.

Witold Waszczykowski said Wednesday the couple came to collect their daughters from the Ariana Grande concert Monday night. The daughters were unharmed.

He did not give the couple's names, but the daughter of Marcin and Angelika Klis has been publicly searching for them since the explosion.

Waszczykowski also said that another Polish citizen was wounded and had undergone surgery in a hospital.

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9:05 a.m.

Germany's interior minister has ordered that flags on federal government buildings be flown at half-staff following the attack in Manchester.

Thomas de Maiziere's ministry said Wednesday that flags will be lowered to half-staff for the day on Wednesday. It described the order as "a signal of sympathy and solidarity after the cruel attack in Manchester."

At least 22 people were killed in Monday evening's attack at an Ariana Grande concert.

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8:55 a.m.

British Home Secretary Amber Rudd says Manchester suicide bomber Salman Abedi was known "up to a point" to the British intelligence services and police.

She said Wednesday the investigation is continuing and declined to provide further details about Abedi, whose improvised bomb killed 22 people at a pop concert in Manchester.

Rudd says Britain's increased official threat level will remain at "critical" as the investigation proceeds.

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8:45 a.m.

France's interior minister says that the suicide bomber who targeted Manchester is believed to have traveled to Syria and had "proven" links with the Islamic State group.

Gerard Collomb said on BFM television Wednesday that British and French intelligence have information that British-born attacker Salman Abedi had been to Syria. He did not provide details, and said it is unclear whether Abedi was part of a larger network of attackers.

Collomb, who spoke with British Prime Minister Theresa May after the attack at an Ariana Grande concert that killed 22, said the two countries should continue cooperating closely on counterterrorism efforts despite Britain's pending exit from the European Union.

With France still under a state of emergency after a string of IS attacks, French President Emmanuel Macron is holding a special security council meeting Wednesday.

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8:30 a.m.

Britons will find armed troops at vital locations after the official threat level was raised to its highest point following a suicide bombing that killed 22.

Officials say soldiers will be deployed to places like Buckingham Palace, 10 Downing Street and Parliament. They will replace armed police as Operation Temperer takes effect Wednesday.

Officials believe this will free up police to fight the threat of further extremist action against civilian targets, amid fears that another attack may be imminent

Police are trying to determine whether suicide bomber Salman Abedi acted alone when he set off his explosives at the end of a pop concert at a Manchester arena. The government Tuesday night raised the threat to "critical", its highest level, following an emergency Cabinet session.