Here’s the quote from Reuters.

NEW YORK, Feb 15 (Reuters) – A number of erroneous options trades executed by Citigroup Inc. (C.N: Quote, Profile, Research) on derivatives market The Pacific Exchange may have caused a small late-morning jump in the Nasdaq Composite Index on Tuesday.
There were a number of erroneous trades of options on the exchange-traded fund Nasdaq 100 (QQQQ.O: Quote, Profile, Research) (“quad-Q”) during morning dealing, according to Dale Carlson, vice president of corporate affairs at the Pacific Exchange.

Danielle Romero-Apsilos, a spokeswoman for Citigroup’s corporate and investment bank, said the erroneous trades were executed by Citigroup and that they occurred at 10:57 a.m. on Tuesday.