Sanaa, Yemen (CNN) -- Yemen's information minister escaped an assassination attempt unharmed Tuesday, his office manager said.
The minister, Ali al-Amrani, was headed to the prime minister's office when the attack occurred, spokesman Abdul Basit al-Qaedi told CNN.
At least 10 bullets were shot in the direction of the vehicle al-Amrani was getting into, al-Qaedi said. Three bullets hit the back window and trunk of the car, he added.
Witnesses said there were at least two gunmen.
Al-Amrani was not hurt in the attack, al-Qaedi said.
The minister's office said al-Amrani has been targeted recently in a hate campaign by pro-revolution groups.
"A number of factions in the country started a hate campaign against the minister and threats were given to him in the past," said al-Qaedi.
Yemen's Interior Ministry told CNN the attack is under investigation, but there are no prime suspects.
Last week, al-Amrani received a death threat by an anonymous caller from a Saudi telephone number, al-Qaedi said.
The minister recently launched a massive presidential campaign to support candidate Abdurabu Hadi, the country's current vice president.
Al-Amrani told CNN the country is facing a critical time for change and all Yemenis must stand together to support Hadi.
Yemen has been beset with demonstrations against President Ali Abdullah Saleh since early last year, when pro-democratic uprisings spread across the Arab world.
Demonstrators have continued their protests against the president, despite a power transfer deal that leads to his departure.
Under the plan, Saleh -- who's been in office for 33 years -- will step down after the February 21 elections and will receive immunity under the plan forged by the Gulf Cooperation Council.
Executive powers have already been transferred to Hadi.