At about 5:50 p.m., a man approached the woman, who was sitting outside of a residence on Latham Street, according to Mountain View police spokeswoman Jaime Garrett.
Without saying anything, the man grabbed the woman's necklace, ripped it from her neck and fled, Garrett said. The man, who was wearing a baseball cap, dark T-shirt and dark pants, was last seen running west on Latham Street.
Police set up a perimeter around the area where the robbery occurred but did not apprehend any suspects, she said.
The necklace, valued at around $300, had a pendant.
A Mountain View couple came home in the middle of a burglary on the afternoon of July 10, police said. About $4,000 in jewelry, electronics and cash was taken.
According to Mountain View police spokeswoman Liz Wylie, a 30-year-old man and his wife left their apartment in the 800 block of E. El Camino Real around 2:45 p.m.
The couple returned about 45 minutes later and heard sounds coming from their bedroom, Wylie said. When they went to investigate, they found the window that had been closed and locked was open, the screen removed and the blinds ripped from the window frame.
Wylie said police are assuming the blinds were damaged when the burglar, or burglars, left in a hurry.
In a bizarre twist, the couple found a half-gallon of milk, which had been taken from their refrigerator, open and spilled on their bedroom floor, Wylie said.
In all, a cell phone, two laptop computers, a digital camera, a wallet containing $1,000, a duffel bag, several watches and miscellaneous jewelry were stolen from the apartment, Wylie said.
Police found no sign of forced entry.
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