LONDON - Former British Prime Minister Margaret Thatcher's ashes have been laid to rest in London at a service attended by her family and closest friends.

The Conservative leader's children, Mark and Carol Thatcher, were among those who gathered for a short service on Saturday before an oak casket containing her ashes was buried at the Royal Hospital Chelsea. Her remains were placed alongside those of her husband Denis, who died in 2003.

A headstone bearing the inscription "Margaret Thatcher 1925 - 2013" was erected on top of the site.

Thatcher, who led Britain from 1979 to 1990, died aged 87 in April.

In April, Britain held a ceremonial funeral with full military honours for Thatcher at St. Paul's Cathedral. About 2,300 guests attended, including dignitaries from 170 countries.