Removing XElements in a foreach loop

So, I have a bug to remove

foreach (XElement x in items.Elements("x")) 
{
    XElement result = webservice.method(x);

    if (/*condition based on values in result*/) 
    {
        x.Remove();
    }
}

The problem is that calling x.Remove() alters the foreach such that if there are two Elements("x"), and the first is removed, the loop doesn't get to the second x element.

So how should I be looping this? Or should this be rewritten another way?