A young girl and her dad have been named among six people who died in a suspected terror attack in Istanbul.
At least 81 were injured, two seriously, in the huge explosion which tore through a popular shopping district of Istiklal Avenue on Sunday.
Heartbreaking footage showed an overturned pram lying in the street and surrounded by debris from the blast.
Yusuf Meydan, who worked for Turkey's ministry of family and social services, and his young daughter Ecrin were among those who died.
The department's minister, Derya Yanik, paid tribute to her colleague as she denounced the "treacherous" attack.
She tweeted: "Our hearts burned with the bitter news of the treacherous attack in Istanbul.
"We lost our colleague Yusuf Meydan and his daughter Ecrin. Our condolences to his family, relatives and colleagues."
The minister continued: "I curse this treacherous attack that killed a father and his daughter.
"As the state, we stand with the families of our brothers and sisters who lost their lives and with our wounded.
"No evil focus will be able to disrupt our unity and solidarity."
On Sunday evening, Vice President Fuat Oktay updated the wounded toll from 53 to 81, with two in a serious condition.
He said: "We consider it to be a terrorist act as a result of a female attacker detonating the bomb."
A female suspect has since been arrested after police released a CCTV image of a woman fleeing the scene moments before the explosion, wearing a hijab, a leather jacket and camouflage combat trousers.
Turkey’s Interior Minister Süleyman Soylu has since confirmed the suspected culprit has been arrested.
“The person who dropped the bomb was detained by our General Directorate of Security,” he told TRT Haber.
Turkish President Recep Tayyip Erdogan said the attack had the "smell of terror" and that its perpetrators would be punished.
Erdogan, who spoke ahead of the Group of 20 summit in Indonesia, said six people were killed.
Justice Minister Bekir Bozdag told pro-government broadcaster A Haber that investigators were focusing on a woman who sat on a bench by the scene of the blast for about 40 minutes.
The explosion took place just minutes after she left. He said her identity was not yet clear, nor was it clear what group might be behind the attack.
A manager of a restaurant near where the bomb went off said he heard the explosion and saw people running.
The dozens of customers inside his restaurant, including women and children, panicked and screamed.
The manager, who spoke on condition of anonymity because of the sensitivity of the situation, said he closed his restaurant's shutters, fearing there might be another explosion, and tried to calm the customers down.
After about 15 to 25 minutes inside, he saw police on the avenue and organized the customers and his staff to leave in small groups.
Numerous foreign governments offered their condolences, including neighboring Greece with which relations are tense.
Prime Minister Kyriakos Mitsotakis said he was "shocked and saddened by the news of the heinous attack."
French President Emmanuel Macron noted that the Istanbul attack came exactly seven years after Islamic State extremists killed 130 people at Paris cafes, the Bataclan theater and France's national stadium.
He said: "On such a symbolic day for our nation, as we are thinking of the victims who fell Nov. 13, 2015, the Turkish people were hit by an attack on their heart, Istanbul.
"To the Turks: We share your pain. We stand at your side in the fight against terrorism."
Turkey was hit by a string of deadly bombings between 2015 and 2017, some by the Islamic State group, others by Kurdish militants who seek increased autonomy or independence.
In recent years, Erdogan has led a broad crackdown on the militants as well as on Kurdish lawmakers and activists.
Amid skyrocketing inflation and other economic troubles, Erdogan's anti-terrorism campaign is a key rallying point for him ahead of presidential and parliamentary elections next year.
Following the attacks between 2015 and 2017 that left more than 500 civilians and security personnel dead, Turkey launched cross-border military operations into Syria and northern Iraq against Kurdish militants, while also cracking down on Kurdish politicians, journalists and activists at home.
While the Kurdish militants, known as the PKK, are considered a terrorist organization by Turkey, the United States and the European Union, critics say Erdogan has also used broad terror laws to stifle free speech.
Most recently, Turkey enacted a controversial " disinformation law " that carries a prison sentence of up to three years for social media users who disseminate false information about domestic or international security, public order or health.
Critics have said the wording of the article is so vague, it can be used to stamp out dissent.
Police on Sunday said they had identified 25 social media users who shared "provocative content" that could fall afoul of that law.
In another example of the country's restrictions on the press, Turkey's media watchdog also imposed temporary limits on reporting on Sunday's explosion - a move that bans the use of close-up videos and photos of the blast and its aftermath.
The Supreme Council of Radio and Television has imposed similar bans in the past, following attacks and accidents.
Access to Twitter and other social media sites was also restricted.
