The suspect is accused of working both in a group and on his own on Saturday.
Authorities say the male suspect and two others are accused of holding up someone at gunpoint around 2 p.m. in the concourse connecting City Hall and 15th Street Stations.
The same man also allegedly robbed someone at gunpoint at 30th Street Station along the Market-Frankford Line just after 9 p.m.
Then a short time later, authorities say he held two people at gunpoint while forcing them to withdraw money from an ATM at the 30th Street Market-Frankford Line Station.
“From all appearances, these seem to be crimes of opportunity,” said SEPTA spokesperson Andrew Busch.
No injuries were reported in connection with robberies.
Police say two other males who were with the suspect have also been taken into custody.
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