Italian street artist Laika says her latest show was attacked by a gang of masked men who damaged her work and threatened the owner of the gallery.

In a video posted online she said three hooded men broke into the Rosso20sette Gallery in Rome and "defaced all the works on display".

She said the gang "restrained the gallery owner" during the attack and told him "if he resisted, they would kill him".

The gallery has previously shown works by Shepard Fairey and Ron English.

The amount lost by Pace Gallery's international business last year. The losses, which do not include its US operation, were registered with Companies House in London and reported by ARTnews.

Boston's Museum of Fine Arts is inviting visitors to watch paint dry.

The museum, led by director Pierre Terjanian, is the latest to make a virtue of its conservation work and open it to the public.

A portrait of a group of 17th-century Dutch wine merchants by Nicolaes Eliasz. Pickenoy is going on show for around a year from December 9 in a pop-up conservation studio while staff clean it, retouch it and add a new layer of varnish.

Other works to have undergone conservation work in public include Rembrandt’s The Night Watch at Amsterdam's Rijksmuseum and Vermeer’s Girl with a Pearl Earring, at the Mauritshuis in The Hague in 1994.

London's National Gallery is bringing together around 25 works by Italian Renaissance master Piero della Francesca for its new show and digitally re-creating others that can not be loaned.

The show, which will run from next October to January, will include works by the 15th-century painter from its own collection as well as the Uffizi in Florence and the Clark Art Institute in Massachusetts.

Co-curated by the gallery's Laura Llewellyn and the Rijksmuseum's Machtelt Bruggen Israels, the show will also include a digital installation of Piero's The Legend of the True Cross - a mural in a chapel in the Italian city of Arezzo.

1 - One of the men arrested during the investigation into the Louvre jewelry heist has had his bid to be released denied by the Paris Court of Appeal. The 40-year-old, named only as Rachid H., denies any part in the $102 million theft. The investigation continues.

2 - New works by artists including Edmund de Waal, Michael Craig-Martin, Rachel Whiteread and Susan Philipsz will all feature in a new outdoor art walk in the grounds of Waddesdon Manor in southeast England. The walk, which opens in July, is called Jacob's Dream in memory of Jacob Rothschild whose family gave the 19th-century country house and its art collection to the nation.

3 - Amsterdam's Van Gogh Museum has announced a major retrospective of painter Eva Gonzales. Curator Fleur Roos Rosa de Carvalho said the exhibition of works by the French painter, who was a contemporary of Van Gogh, would show her as "a genuine and serious artist who had keenly absorbed the developments of her time, and who always remained true to herself".

4 - Artist Raven Chacon has been appointed curator at large at the D16 exhibition scheduled to open in Kassel, Germany, next June. Its artistic director Naomi Beckwith said she was joining a team "whose convictions are as strong as their commitment to collaborative practice".