Iran on Saturday lifted restrictions on Telegram’s application, which was blocked by authorities when security forces tried to contain the biggest protests of its kind in the country since 2009, the official IRNA news agency reported.

“A source familiar with the termination of the restrictions on the implementation of the Tigram and users can use it.”

At least 22 people have been killed and 1,000 arrested in anti-government protests that began in late December. As the protests ebbed, the government last week lifted restrictions on Anstagram, a social networking site used to rally protesters.

Telegram, used by some 40 million people in Iran, has closed a channel Tehran has accused of encouraging violence but has refrained from closing other channels, prompting Iranian authorities to withhold access.

Iran continues to impose restrictions on the Internet and social networking sites as Facebook and Twitter remain blocked.