From FCO website:
This advice has been reviewed and reissued with an amendment to the Travel Summary and the Terrorism section (threat of retaliatory attacks following French military intervention in Mali). The overall level of the advice has not changed; there are no travel restrictions in place in this travel advice for Morocco.
Terrorism
There is a general threat from terrorism in Morocco. See Terrorism. This threat is sustained, including due to a threat of retaliatory attacks following the French intervention in Mali. Attacks could be indiscriminate, including in places frequented by expatriates and foreign travellers. You should take sensible safety precautions and maintain a high level of vigilance at all times.
Read more: http://www.fco.gov.uk/content/en/travel-advice/middle-east-north-africa/morocco/fco_trv_ca_morocco