By Jim Melwert, Dray Clark, Ileana Diaz

TREVOSE, Pa. (CBS) – The search continues for two missing teens who were last seen swimming with a friend in Neshaminy Creek Tuesday night. That friend made it to shore, but his friends were swept away and the families of the two missing teenagers are trying to hold on to hope as they face a harsh reality (see related story).

It’s been 20 hours since anyone last saw 18-year-old Dan Tadrzynski and Perry Krewson of Bensalem Township. The search began shortly after police got the call around 10:30 p.m. Tuesday and it has been on-going, though officials did have to scale back the search in the water of the creek, as it was just too dangerous.

Bensalem Township Director of Public Safety Fred Harran says the search is likely a recovery effort rather than a rescue at this point and he hopes, with this and the drowning of a 13-year-old in the Pennypack Creek earlier this month, teens realize the dangers of swimming in creeks and rivers.

“We always warn people, it’s on the news all the time, with all these creeks all over the Delaware Valley, [but] again, no one thinks it’s going to happen to them,” he explains.

He says with all the rain and debris washed into the river, even experienced swimmers would get caught in the raging waters.

Crews spent all day searching for the two teens who recently graduated from Bensalem High School. Blood hounds canvassed the ground nearby as divers covered the water search and Marines assisted as well. They showed up to help find Krewson; he enlisted in the Marines and had big plans.

“He was starting bootcamp next month,’ says Harran.

Now all the families can do is wait for answers as the search and rescue teams continue to work.

Authorities say search efforts will resume Thursday morning.

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