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A leading opposition lawmaker in Ghana, Joseph Boakye-Danquah, has been found stabbed to death at his home in the capital Accra, police said on Tuesday.

Greater Accra regional police commander George Dampare said the killing happened early on Tuesday and an investigation had been launched.

“We can't immediately tell what might have led to this,” he added.

Boakye-Danquah, who represented the Abuakwa North constituency in the Eastern Region, was a member of the main opposition New Patriotic Party (NPP).

In 2010, he was attacked and stabbed, suffering deep cuts to his hand.

Three people were prosecuted and convicted for the attack in 2013.

But it was not immediately clear whether there was a link with the latest attack.

Dampare said two security guards at the politician's house were taken in for questioning.

The NPP is Ghana's biggest opposition party and its candidate, Nana Akufo-Addo, was President John Dramani Mahama's rival in the 2012 presidential election in Ghana.

The pair will face off again for the presidency at elections scheduled in November.

Attacks on politicians are rare in Ghana but another leading member of the NPP, Adam Mahama, died in May last year after an acid attack.

Mahama, who is no relation to Ghana's head of state, was at the time chairman of the NPP in the Upper East Region.

The younger brother of a leading NPP figure was later charged in connection with the attack.