This has been tried in the courts a few times. Here are your rights:

1. You can film anyone in the street while on public property.
2. An officer CAN order you to move away, or move to another location.
3. An officer CANNOT order you to stop filming or taking pictures.
4. As long as you follow the directions in item 2, the officer CANNOT take your camera away.

That won't stop them from doing so, of course.

Weird that they said they are investigating a missing memory card from an iPhone, since iPhones do not have removable memory. Then again, modern journalists can barely describe what a computer is.