The day started with a hurried departure and the promise of a resignation.

Sri Lankans woke to the news that overnight President Gotabaya Rajapaksa, the man whose family had ruled the island with an iron fist for most of the last two decades, had fled the country having promised to leave his job.

His rule has given rise to mass protests, as people struggle with daily power cuts and shortages of basics like fuel, food and medicines.

At Galle Face Green in the capital Colombo, one of the main centres of the protests, hundreds roamed the streets and listened to fiery speeches from fellow citizens railing against the government and leaders who had steered the country into its worst economic crisis in decades.

Some were happy to see the back of Mr Rajapaksa. But for others like protester GP Nimal, his departure was nothing short of thwarted justice.

"We don't like it. We want to keep him. We want our money back! And we want to put all the Rajapaksas in an open prison where they can do farm work," he said.

As the day wore on, the crowds swelled at Galle Face Green, which took on a festive atmosphere.

Then, the mood changed. Word spread that something was happening at the prime minister's office at Flower Road.

The unrest there came as Prime Minister Ranil Wickremesinghe was appointed acting president by the departing Mr Rajapaksa, and declared a state of emergency and regional curfew in the western region which includes the capital. Mr Wickremesinghe has also faced growing popular anger for his role in the crisis, and protesters are calling for him to resign as well.

Thousands began streaming towards the prime minister's compound. Above their heads, a military helicopter flew low passes, prompting howls of anger and middle fingers from the crowd.

Angry protesters were attempting to break into the grounds of the compound, as rows of poker-faced soldiers and riot police lining the walls looked on. Occasionally a canister of tear gas would be fired at the crowd, but it did little to deter them.

Protesters climbed up on the black gates to the compound and started rocking them back and forth to tear them off their hinges. The metallic thumps echoed down the avenue to cheers, which only intensified when protesters succeeded in ripping the gates down. They were met by a wall of soldiers.

This appeared to unnerve the military. Suddenly the crowd was pelted with a volley of tear gas canisters shot from inside the compound. The avenue was wreathed in smoke. Protesters screamed in defiance, and began picking up the canisters with their bare hands or traffic cones and hurling them back into the compound.

The next hour saw more volleys of tear gas, each round more intense than the last. Soldiers arrived at one end of the avenue and began shooting their canisters high above the crowd. Arcs of smoke streaked across the blue sky, as the canisters transformed into dangerous projectiles. A man fell to the ground, clutching his shoulder after it was hit by flying debris.