Two gunmen have reportedly blown themselves up.
Militant group Islamic State on Wednesday claimed responsibility for a suicide attack on a television station in Afghanistan's eastern province of Nangarhar that killed a security guard as well as all three attackers and wounded at least 17 people.
Islamic State, or Daesh as it is generally known in Afghanistan, has established a stronghold in the province bordering Pakistan, where it fights both the Taliban and Afghan government forces.
As the attack unfolded, heavy gunfire could be heard from around the building of RTA, Afghanistan's national broadcaster, located close to the governor's compound in the provincial capital, Jalalabad.
"Islamic State fighters are currently carrying out an attack inside the state broadcasting building in the city of Jalalabad," the movement's AMAQ newsagency said in a statement on instant messaging service Telegram.
The Taliban, which also has a strong presence in the region, denied responsibility.
Earlier in the day. gunmen attacked a building of Afghan state television in the eastern city of Jalalabad on Wednesday and engaged in a gun battle with security forces, the provincial governor's spokesman said.
"We can confirm that a number of insurgents have entered the building," said Attaullah Khughyani. "Who they are, and what their target is, is still not clear."
He said there appeared to have been at least three attackers, two of whom had blown themselves up while at least one was still fighting.
Heavy gunfire could be heard from around the building of RTA, Afghanistan's national broadcaster, located close to the provincial governor's compound. Jalalabad is the capital of Nangarhar, the eastern province on the border with Pakistan where Islamic State fighters have established a stronghold, but there is also a strong Taliban presence in the region.
Insurgents fighting to oust the Western-backed government in Kabul have conducted a series of high-profile attacks this year on targets including Afghanistan's largest military hospital and a military base in the northern city of Mazar-i-Sharif.
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