Police have released new surveillance video of a suspect tied to two attacks on female MTA workers involving a liquid substance believed to be urine.

Officials say the attacks happened hours apart on April 12. The first attack was on the 6 train at 10:30 a.m., and the second attack happened an hour later at a BX1 bus stop.

The suspect splashed a female train conductor then an MTA bus driver with the liquid, police say. The new video shows the suspect holding a bottle full of the liquid.

"When we open that door, we don't know what's getting on that bus," says Trellis Robinson, one of the victims. "That's what makes our job so much more dangerous."

MORE: Police: Man wanted for throwing cups of urine in 2 MTA workers’ faces

New York City Transit President Andy Byford promised justice for the workers, saying in a statement, "This attack is absolutely disgraceful and we will do whatever we can to help NYPD identify the perpetrator."

All MTA workers are urged to stay alert as police continue their investigation.

Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS.