Around 1:00 this afternoon four PECO transformers exploded in center city while crews were doing repairs underground. Manhole covers blew off and 16th street between Chestnut and Market was closed off, causing all sorts of traffic fun.

Meghan Walter, who works at 16th and Chestnut, said: “Billows of smoke rose from the ground and steam grates as well as a huge fire ball. Quite terrifying/thrilling.”

For more details, there is an article and video on NBC10.com.