Strange ICMP in pfTop

[mdsxt]

I am brand new to pfSense, just installed my box yesterday.  I was checking logs and noticed this weird entry in pfTop.

At one point the bytes was @ 14M which I think means 14 million

Here is a snippet from pfTop

pfTop: Up State 1-405/405, View: size, Order: none
PR    D  SRC                          DEST                          PKTS  BYTES STATE  AGE  EXP A

icmp O 24.xx.xx.57:33346  24.12.144.1:33346    1454  113K  0:0    736    10 *

can someone tell me what this could be?

[cmb]

Gateway monitoring for Status>Gateways and quality RRD graph.