"halt activities" is correct and usable in written English.
You can use it to describe the ending of a period of activity, or to indicate that something should stop. For example, "We must halt all activities in preparation for the storm."
Letta also promised that he would talk to ENI CEO Scaroni about the energy giant's ongoing operations in Iran and, if he could, persuade them to halt activities.
Last Thursday about 300 students blockaded administration buildings and started boycotting classes in an effort to halt activities at the liberal arts college.
He said now that India had agreed to discuss Kashmir, it would be easier for Pakistan to persuade militants to halt activities, at least temporarily.
Included in the legislation are new powers for the Federal Reserve to push undercapitalised banks towards bankruptcy protection and halt activities that threaten the soundness of a bank or the "financial stability of the United States".
The action hit at least 10 states, bringing to a halt activities at Brazil's busiest port, Santos, and in Itaguai, in the south, and Suape, in the north-east.
The country's economy took a hard hit during the outbreak, particularly as fear of the virus caused airlines to cancel flights and businesses to halt activities.
He considered sleep to be a defensive reaction to halt activity of the organism and thereby prevent exhaustion.
Lt Col Kitson said Patrol Base Almas was set up to halt activity in what had become a "no-go area" known as the Taliban Playground.
But the attack comes within hours of signs of a breakthrough after Mr Sharon indicated to Mr Maher that Israel would halt activity against the militants if there was a ceasefire.
The area in which Dakota Access agreed to halt activity until Friday represented some but not all of the area requested in the temporary restraining order.
However, a few days later, Foreign Minister Javad Zarif announced, "Iran will press on with construction at a nuclear reactor site at Arak" with Reuters reporting that the move came "despite an agreement with Western powers to halt activity".
