Sudan's prime minister said Monday he survived a "terror attack" after an explosion and gunfire targeted his motorcade in the capital Khartoum.

Abdalla Hamdok, a longtime economist, tweeted he was "safe and in good shape" following the explosion. Sudanese state TV said Hamdok had been heading to his office when the attack took place.

Hamdok also tweeted a photo of himself smiling and seated at a large desk, while a TV behind him showed news coverage reporting he'd survived.

The attack highlighted the fragility of Sudan's transition to civilian rule, almost a year after pro-democracy protesters forced the military to remove autocratic President Omar al-Bashir from power and replace him with a joint military-civilian government, which has promised to hold elections in three years.

Hamdok, in his brief statement on Twitter, said, "Rest assured that what happened today will not stand in the way of our transition, instead it is an additional push to the wheel of change in Sudan."

No one immediately claimed responsibility for the attack.

The country's top prosecutor, Taj al-Ser Ali al-Hebr, said in a statement that prosecutors have embarked on their investigation into the "professionally plotted" attack.

A statement from the prime minister's office said the attackers used explosives and firearms, and that a security officer was lightly wounded. The statement was read by Faisal Saleh, Sudan's information minister and interim government spokesman. He said the convoy was hit near the Kober Bridge.

Footage posted online showed two white, Japanese-made SUVs typically used by Sudan's top officials parked on a street, damaged with its widows broken. Another vehicle was badly damaged in the blast. Several dozen people were seen at the site of the attack, chanting: "With our blood and soul, we redeem you, Hamdok."

The protest movement that led the uprising against al-Bashir called the blast a "terrorist attack." The statement by the Forces for the Declaration of Freedom and Change called on people to take to the streets to "show our unity and cohesion ... and protect the transitional authority."

Youth activists face arrest and intimidation and are still reeling from a ferocious crackdown by security forces last summer that broke up their sit-in outside the military's headquarters and killed dozens.

After months of negotiations, the military and the pro-democracy movement reached a power-sharing deal in August, at which point Hamdok took office. The deal established a joint military-civilian, 11-member sovereign council to govern Sudan for the next three years.

Prominent activist Khalid Omar, secretary general of the Sudanese Congress Party, said the attempt on Hamdok's life was a "new chapter in the conspiracy against the Sudanese revolution."

UN spokesperson Stephane Dujarric said UN chief Antonio Guterres was "shocked and saddened" to learn of the attack and expressed "full solidarity" with the prime minister and people of Sudan.

The U.S. Embassy in Sudan tweeted: "We continue to support Sudan's civilian led transitional government and stand in solidarity with the Sudanese people."

Irfan Siddiq, the British ambassador in Khartoum, said the blast "is a deeply worrying event must be investigated fully." He tweeted that the Sudanese prime minister's office had confirmed Hamdok and his team "are all fine, with no injuries."

Hamdok met Monday with Egypt's intelligence chief, Abbas Kamel, who was visiting Sudan. Kamel also met with Gen. Abdel Fattah Burhan, head of the joint military-civilian sovereign council. He said Egypt "stands by the transitional government and the Sudanese people against the attempted attack," according to a statement from the sovereign council.

Monday's blast came less than two months after an armed revolt from within Sudan's security forces shut down the capital's airport and left at least two people dead. The tense stand-off between the armed forces and rogue intelligence officers paralyzed street life in several parts of Khartoum, along with another western city.

(Cover image: Sudan's new Prime Minister Abdalla Hamdok speaks during a press conference in Khartoum, Sudan August 21, 2019. /AP)

(With input from AP)