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And there was good reason for this. At least 45 journalists and media workers have been killed in the country since 2001. The have seen an uptick in deadly attacks even though the targeted murders of journalists had declined, according to CPJ's . Until this week.

On Monday, as Marai was headed to the scene of a suicide blast with his camera, rushing to the site within minutes of the attack and assuring his colleague on the way that he would take photos and video, his fear became reality.

A suicide bomber, disguised as a member of the media, set off his explosives several minutes after the initial explosion in what appeared to be a and first responders who flocked to the scene.

At least nine journalists were killed in the brazen assault. In a separate attack, unidentified gunmen shot dead a BBC Pashto journalist, Ahmad Shah, in Khost province on the border with Pakistan.

Unfortunately, the tactic of targeting journalists who head to the scene is not new. Suicide bombers in Pakistan and Iraq have also targeted journalists in double-suicide attacks, waiting for journalists to gather at the scene of a bombing before launching another attack.

In 2013, at least two journalists were killed while reporting on the aftermath of an explosion in Pakistan, while the year before, several Pakistani journalists in a bomb blast apparently targeting media and other first responders who were responding to an earlier explosion.

Attackers know that journalists will be covering events like explosions, attacks, or vigils, because they are inherently newsworthy. By deliberately targeting them, assailants are seeking not only to murder reporters but to send a signal to the broader public: Beware.

At least 45 journalists and media workers have been killed in the country since 2001

The attack was the most deadly day for journalists in Afghanistan since the fall of the Taliban in 2001, which is significant for a country where journalists are routinely killed, threatened and attacked for reporting the news.

It is also devastating to Afghanistan's burgeoning independent media scene as the country prepares for parliamentary elections scheduled for October. And it was not just an attack on Afghan journalists, but on the global information network - because without these journalists, the world would not know what is going on in Afghanistan.

Some of the journalists killed were under 30 years old, and thus part of the next generation of journalists who would be covering their country's transition and helping to hold those in power to account.

Maharam Durani, a 28-year-old law student who was training to become a journalist, was one of them. She was due to start working on one of the US-funded RFE/RL's Radio Free Afghanistan weekly woman's programme on May 15.

Instead, she has become one of the seven women journalists killed in the country since we began documenting in the early 1990s.

Durani's death is a blow not just to her family and colleagues, but to young women throughout the country who aspire to a career in journalism. A by the Center for the Protection of Afghan Women Journalists found that the presence of women journalists in Afghanistan has decreased recently, especially over the previous two years, mainly due to insecurity and violence.

One must truly be brave to pursue a journalism career in Afghanistan, where journalists face threats not only from non-state actors like the Islamic State group and the Taliban, which have claimed responsibility for bombing media organisations over the years, but also from security forces.

Last year IS killed at least six people in an attack on the Jalalabad office of National Radio Television of Afghanistan (RTA), and killed one and injured many more in a suicide attack on leading Pashto-language Shamshad TV.

Like the vast majority of journalists killed each year, the 10 journalists killed just days before World Press Freedom Day were local journalists, committed to bringing the news of their homeland to the public. Of the 1,290 journalists killed since CPJ began keeping records in the early 1990s, 1,136 were local journalists.

Afghanistan has maintained one of the worst rates of impunity in journalist murders for nearly a decade

Sadly, it is nearly guaranteed that no one will ever be brought to justice, as nine in ten killers of journalists go free. Afghanistan has maintained one of the worst rates of impunity in journalist murders for nearly a decade, and no doubt the failure to address high rates of impunity in violence against journalists has contributed to making journalists targets of further terrible attacks. 

The Afghan government must respond swiftly and decisively by launching an investigation into these brutal murders and ensuring that those who ordered the suicide bombing and the killing of the BBC's Shah are not allowed to roam free.

On World Press Freedom Day, Afghan leaders must pay tribute to Marai, Durani, Shah and all of these brave journalists who lost their lives by taking decisive and meaningful action to turn the tide on impunity and send the signal that the murder of journalists will no longer be tolerated.  

Follow her on Twitter: Opinions expressed in this article remain those of the author and do not necessarily represent those of °®Âþµº, its editorial board or staff.