The fire broke out around 9 a.m. on Thursday near 4th and Race Streets after construction crews reportedly struck a gas main.
The call reportedly came in at 1:36 p.m. about a ruptured PSG&E pipe on a construction site along Route 130 near Burlington Road.
Authorities say the line was struck at Emmons Drive on Route 1 Southbound around 10:30 a.m. Monday.
A gas line was struck at the Wallingford Swim Club in Delaware County on Friday night.
New Castle County police are looking for the driver of a car that backed into a house and broke a gas line, forcing evacuations.