Please identify all the named entities mentioned in the input sentence provided below. Use only the categories: PER - person, ORG - organization, and LOC - location.
Remember, nationalities are neither locations nor organizations, and organizations can represent other groups of people.
Pay attention to the provided example. You should only output the results in JSON format, following a similar structure to the example result provided.

Example sentence and results:

Where in the world is Iguazu?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Iguazu",
        "Start": 22,
        "End": 28
    }
]

Considering the input sentence below, what is the output result?

The same week, the WTC head testified that while they had not received any briefing on the use of planes, they had taken steps to prepare for an attack using anthrax based on intelligence that had been received.


"Results": [
    {
        "TypeName": "LOC",
        "Text": "WTC",
        "Start": 19,
        "End": 22
    }
]