U.S. cyber-attacks against Iranian targets have not been successful, Iran’s telecoms minister said on Monday, within days of reports that the Pentagon launched a long-planned cyber-attack to disable the country’s rocket launch systems.

“They try hard, but have not carried out a successful attack,” Mohammad Javad Azari-Jahromi, Iran’s minister for information and communications technology, said on social network Twitter.

U.S. cyber-attacks against Iranian targets have not been successful, Iran’s telecoms minister said on Monday, within days of reports that the Pentagon launched a long-planned cyber-attack to disable the country’s rocket launch systems.

“They try hard, but have not carried out a successful attack,” Mohammad Javad Azari-Jahromi, Iran’s minister for information and communications technology, said on social network Twitter.