The hack, which purported to be carried out in the name of a fringe militant group, came after the Bahraini authorities dissolved the kingdom's last major opposition movement and after police shot dead five protesters while dispersing a long-running sit-in.
Bloodied bodies, demolished mosques and what appeared to be a child's illustration of war rolled down the official Twitter page of Foreign Minister Khaled bin Ahmad al-Khalifa, a member of the royal family.
The foreign ministry confirmed the hack, blaming it on the "terrorist party," without elaborating.
Bahrain has been gripped by persistent unrest since 2011 when its Sunni rulers crushed protests led by its Shiite majority demanding a constitutional monarchy and an elected prime minister.
The authorities have jailed several opposition leaders on charges of inciting violence but human rights groups say the mainstream opposition has remained peaceful.
Today's hackers tagged their posts with the name and logo of Saraya al-Mukhtar, a Shiite militant group with a strong online presence, and made threats against the ruling Al- Khalifa family.
The hackers also spoke out against the treatment of Shiites in neighbouring Saudi Arabia and in Yemen, where a Saudi-led coalition including Bahrain is fighting Shiite rebels who control the capital Sanaa.
"We will soon reap the skulls of you who danced on the blood of our men in Bahrain, Qatif and Yemen," another tweet said.
The hackers retweeted a number of posts by Numur al- Hurriya (Tigers of Freedom), which purports to be an opposition group in the mainly Shiite Qatif district of eastern Saudi Arabia.
Sunni-dominated Saudi Arabia has seen repeated disturbances among its Shiite minority, most of whom live in the east, close to the causeway linking it with Bahrain.
Neighbouring Qatar is still investigating the May 24 hack of its official news agency website and Twitter account in which damaging comments about a raft of sensitive regional issues were falsely attributed to its ruler.
The hackers also posted a fake report that Qatar had severed relations with several neighbouring countries.
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