London Irish back Armitage was detained by Devon and Cornwall Police following an incident in a nightclub early on January 29, according to an RFU statement. He was later released on bail.
Armitage had been released from the England Saxons camp following the international match against the Ireland Wolfhounds on January 28.
It comes in the same month that Harlequins scrum-half Danny Care was told he would not be considered for England Six Nations selection this season following his arrest for drink-driving on New Year's Day.
Care subsequently appeared before Southampton magistrates, where he admitted a drink-driving charge, He was fined 3,000 and banned from driving for 16 months.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The Barbarians are one of the top invitational rugby sides with a long history and classic rugby jersey.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Lions get ready for their matches with this green training jersey. It's what the players wear. Get in the Gear!
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The Lions are ready to get their Australia tour underway. They arrive in Perth on Monday.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.